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doc-exports/docs/dws/tool/dws_16_0167.html
luhuayi a5e3903f6b DWS TG 910.211 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: luhuayi <luhuayi@huawei.com>
Co-committed-by: luhuayi <luhuayi@huawei.com>
2025-04-23 13:53:01 +00:00

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<a name="EN-US_TOPIC_0000001813598644"></a><a name="EN-US_TOPIC_0000001813598644"></a>
<h1 class="topictitle1">Unique Indexes</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_p330274862511">GaussDB(DWS) does not support the combination of unique indexes (constraints) and primary key constraints. DSC will perform adaptation based on GaussDB(DWS) features during migration.</p>
<div class="caution" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_note49007161318"><span class="cautiontitle"><img src="public_sys-resources/caution_3.0-en-us.png"> </span><div class="cautionbody"><p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_p790207191318">If MySQL unique indexes (constraints) and primary key constraints are used together during migration, OLAP distribution keys may become unavailable. Therefore, this scenario is not supported by DSC.</p>
</div></div>
<ol id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_ol12553123692615"><li id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_li15553183615265">For a unique inline index, if the primary key index and the unique index are the same column, DSC will remove the unique index during migration.<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_p135691921172717"><a name="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_li15553183615265"></a><a name="en-us_topic_0000001385792490_en-us_topic_0214164547_li15553183615265"></a><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_b123631548192715">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_screen182799185276"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">IF</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">EXISTS</span><span class="w"> </span><span class="o">`</span><span class="k">public</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">runoob_dataType_test</span><span class="o">`</span>
<span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">id</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="n">AUTO_INCREMENT</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">name</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">128</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="p">(</span><span class="n">id</span><span class="w"> </span><span class="k">ASC</span><span class="p">)</span>
<span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_p77858251279"><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_b197144504277">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_screen71919285272"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span>
<span class="normal">8</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">IF</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">EXISTS</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_datatype_test&quot;</span>
<span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;id&quot;</span><span class="w"> </span><span class="nb">SERIAL</span><span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;name&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">128</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span>
<span class="p">)</span>
<span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">ORIENTATION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">ROW</span><span class="p">,</span><span class="w"> </span><span class="n">COMPRESSION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">NO</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="n">NOCOMPRESS</span>
<span class="w"> </span><span class="n">DISTRIBUTE</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">HASH</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;id&quot;</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
</li><li id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_li19672194516269">If there is a unique index created by <strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_b252183214403">ALTER TABLE</strong>, DSC will create a normal index based on GaussDB(DWS) features.<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_p1287443289"><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_b728710413284">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_screen9287164132817"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span>
<span class="normal">19</span>
<span class="normal">20</span>
<span class="normal">21</span>
<span class="normal">22</span>
<span class="normal">23</span>
<span class="normal">24</span>
<span class="normal">25</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">IF</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">EXISTS</span><span class="w"> </span><span class="o">`</span><span class="k">public</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">runoob_alter_test</span><span class="o">`</span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType1</span><span class="o">`</span><span class="w"> </span><span class="nb">int</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType2</span><span class="o">`</span><span class="w"> </span><span class="nb">FLOAT</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span><span class="mi">2</span><span class="p">),</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType3</span><span class="o">`</span><span class="w"> </span><span class="n">DOUBLE</span><span class="p">(</span><span class="mi">20</span><span class="p">,</span><span class="mi">8</span><span class="p">)</span>
<span class="p">)</span><span class="n">ENGINE</span><span class="o">=</span><span class="n">InnoDB</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="n">CHARSET</span><span class="o">=</span><span class="n">utf8</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="n">idx_runoob_alter_test_datatype1</span><span class="p">(</span><span class="n">dataType1</span><span class="p">);</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="n">idx_runoob_alter_test_datatype1</span><span class="p">(</span><span class="n">dataType2</span><span class="p">);</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="n">idx_runoob_alter_test_datatype1</span><span class="p">(</span><span class="n">dataType3</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">IF</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">EXISTS</span><span class="w"> </span><span class="o">`</span><span class="k">public</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">runoob_alter_test</span><span class="o">`</span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType1</span><span class="o">`</span><span class="w"> </span><span class="nb">int</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType2</span><span class="o">`</span><span class="w"> </span><span class="nb">FLOAT</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span><span class="mi">2</span><span class="p">),</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType3</span><span class="o">`</span><span class="w"> </span><span class="n">DOUBLE</span><span class="p">(</span><span class="mi">20</span><span class="p">,</span><span class="mi">8</span><span class="p">),</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType4</span><span class="o">`</span><span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType5</span><span class="o">`</span><span class="w"> </span><span class="k">YEAR</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'2018'</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType6</span><span class="o">`</span><span class="w"> </span><span class="n">DATETIME</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'2018-10-12 15:27:33.999999'</span>
<span class="p">)</span><span class="n">ENGINE</span><span class="o">=</span><span class="n">InnoDB</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="n">CHARSET</span><span class="o">=</span><span class="n">utf8</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">CONSTRAINT</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="n">idx_runoob_alter_test_datatype1</span><span class="p">(</span><span class="n">dataType1</span><span class="p">);</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">CONSTRAINT</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="n">idx_runoob_alter_test_datatype2</span><span class="p">(</span><span class="n">dataType2</span><span class="p">);</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">CONSTRAINT</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="n">idx_runoob_alter_test_datatype3</span><span class="p">(</span><span class="n">dataType3</span><span class="p">);</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">CONSTRAINT</span><span class="w"> </span><span class="n">constraint_dataType</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="n">idx_runoob_alter_test_datatype4</span><span class="p">(</span><span class="n">dataType4</span><span class="p">);</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">CONSTRAINT</span><span class="w"> </span><span class="n">constraint_dataType</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="n">idx_runoob_alter_test_datatype5</span><span class="p">(</span><span class="n">dataType5</span><span class="p">);</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">CONSTRAINT</span><span class="w"> </span><span class="n">constraint_dataType</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="n">idx_runoob_alter_test_datatype6</span><span class="p">(</span><span class="n">dataType6</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_p142870442811"><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_b10288134162811">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_en-us_topic_0214164547_screen19288648288"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span>
<span class="normal">19</span>
<span class="normal">20</span>
<span class="normal">21</span>
<span class="normal">22</span>
<span class="normal">23</span>
<span class="normal">24</span>
<span class="normal">25</span>
<span class="normal">26</span>
<span class="normal">27</span>
<span class="normal">28</span>
<span class="normal">29</span>
<span class="normal">30</span>
<span class="normal">31</span>
<span class="normal">32</span>
<span class="normal">33</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">IF</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">EXISTS</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span>
<span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;datatype1&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype2&quot;</span><span class="w"> </span><span class="nb">REAL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype3&quot;</span><span class="w"> </span><span class="n">DOUBLE</span><span class="w"> </span><span class="k">PRECISION</span>
<span class="p">)</span>
<span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">ORIENTATION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">ROW</span><span class="p">,</span><span class="w"> </span><span class="n">COMPRESSION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">NO</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="n">NOCOMPRESS</span>
<span class="w"> </span><span class="n">DISTRIBUTE</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">HASH</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype1&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_runoob_alter_test_datatype1&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype1&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_runoob_alter_test_datatype1&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype2&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_runoob_alter_test_datatype1&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype3&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">IF</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">EXISTS</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span>
<span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;datatype1&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype2&quot;</span><span class="w"> </span><span class="nb">REAL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype3&quot;</span><span class="w"> </span><span class="n">DOUBLE</span><span class="w"> </span><span class="k">PRECISION</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype4&quot;</span><span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype5&quot;</span><span class="w"> </span><span class="nb">SMALLINT</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'2018'</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype6&quot;</span><span class="w"> </span><span class="k">TIMESTAMP</span><span class="w"> </span><span class="k">WITHOUT</span><span class="w"> </span><span class="k">TIME</span><span class="w"> </span><span class="k">ZONE</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'2018-10-12 15:27:33.999999'</span>
<span class="p">)</span>
<span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">ORIENTATION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">ROW</span><span class="p">,</span><span class="w"> </span><span class="n">COMPRESSION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">NO</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="n">NOCOMPRESS</span>
<span class="w"> </span><span class="n">DISTRIBUTE</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">HASH</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype1&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_runoob_alter_test_datatype1&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype1&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_runoob_alter_test_datatype2&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype2&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_runoob_alter_test_datatype3&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype3&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_runoob_alter_test_datatype4&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype4&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_runoob_alter_test_datatype5&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype5&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_runoob_alter_test_datatype6&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype6&quot;</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
</li><li id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_li14995834193418">If there is a unique index created by <strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_b2582123413403">CREATE INDEX</strong>, DSC will create a normal index based on GaussDB(DWS) features.<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_p10237131217357"><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_b11238191223514">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_screen1023871253510"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span>
<span class="normal">8</span>
<span class="normal">9</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="o">`</span><span class="k">public</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">test_index_table01</span><span class="o">`</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">TABLE01_ID</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="p">(</span><span class="mi">11</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">TABLE01_THEME</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">AUTHOR_NAME</span><span class="o">`</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">AUTHOR_ID</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="p">(</span><span class="mi">11</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">CREATE_TIME</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="p">(</span><span class="o">`</span><span class="n">TABLE01_ID</span><span class="o">`</span><span class="p">)</span>
<span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="n">AUTHOR_INDEX</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="o">`</span><span class="n">test_index_table01</span><span class="o">`</span><span class="p">(</span><span class="n">AUTHOR_ID</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_p18238412113514"><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_b423801273512">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_screen14238512173513"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;test_index_table01&quot;</span>
<span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;table01_id&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;table01_theme&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">400</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;author_name&quot;</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">40</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;author_id&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;create_time&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;table01_id&quot;</span><span class="p">)</span>
<span class="p">)</span>
<span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">ORIENTATION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">ROW</span><span class="p">,</span><span class="w"> </span><span class="n">COMPRESSION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">NO</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="n">NOCOMPRESS</span>
<span class="w"> </span><span class="n">DISTRIBUTE</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">HASH</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;table01_id&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;author_index&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;test_index_table01&quot;</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;author_id&quot;</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
</li><li id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_li19273353162415">If CREATE TABLE has multiple unique indexes, during migration, DSC will create all unique indexes as common indexes based on GaussDB(DWS) features.<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_p16461040142712"><a name="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_li19273353162415"></a><a name="en-us_topic_0000001385792490_li19273353162415"></a><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_b196461940142714">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_screen10646124012270"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span>
<span class="normal">8</span>
<span class="normal">9</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="o">`</span><span class="k">public</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">test_index_table01</span><span class="o">`</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">TABLE01_ID</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="p">(</span><span class="mi">11</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">TABLE01_THEME</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">AUTHOR_NAME</span><span class="o">`</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">AUTHOR_ID</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="p">(</span><span class="mi">11</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">CREATE_TIME</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="k">UNIQUE</span><span class="p">(</span><span class="o">`</span><span class="n">TABLE01_ID</span><span class="o">`</span><span class="p">),</span>
<span class="w"> </span><span class="k">UNIQUE</span><span class="p">(</span><span class="o">`</span><span class="n">AUTHOR_ID</span><span class="o">`</span><span class="p">)</span>
<span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_p1664613408276"><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_b4646440122714">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_screen136461406270"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span>
<span class="normal">8</span>
<span class="normal">9</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;test_index_table01&quot;</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;table01_id&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;table01_theme&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">400</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;author_name&quot;</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">40</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;author_id&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;create_time&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span>
<span class="p">)</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span><span class="n">ORIENTATION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">ROW</span><span class="p">,</span><span class="w"> </span><span class="n">COMPRESSION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">NO</span><span class="p">)</span><span class="w"> </span><span class="n">NOCOMPRESS</span><span class="w"> </span><span class="n">DISTRIBUTE</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">HASH</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;table01_id&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_test_index_table01_table01_id&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;test_index_table01&quot;</span><span class="p">(</span><span class="ss">&quot;TABLE01_ID&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_test_index_table01_author_id&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;test_index_table01&quot;</span><span class="p">(</span><span class="ss">&quot;AUTHOR_ID&quot;</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
</li><li id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_li577711503277">If CREATE TABLE has a unique index but does not have a primary key index, DSC retains the unique index based on GaussDB (DWS) features during migration.<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_p893219516308"><a name="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_li577711503277"></a><a name="en-us_topic_0000001385792490_li577711503277"></a><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_b9932125113020">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_screen1493212543016"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span>
<span class="normal">8</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="o">`</span><span class="k">public</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">test_index_table01</span><span class="o">`</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">TABLE01_ID</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="p">(</span><span class="mi">11</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">TABLE01_THEME</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">AUTHOR_NAME</span><span class="o">`</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">AUTHOR_ID</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="p">(</span><span class="mi">11</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">CREATE_TIME</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="k">UNIQUE</span><span class="p">(</span><span class="o">`</span><span class="n">AUTHOR_ID</span><span class="o">`</span><span class="p">)</span>
<span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_p179321543014"><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_b15932752302">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_screen149326533013"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span>
<span class="normal">8</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;test_index_table01&quot;</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;table01_id&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;table01_theme&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">400</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;author_name&quot;</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">40</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;author_id&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;create_time&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;author_id&quot;</span><span class="p">)</span>
<span class="p">)</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span><span class="n">ORIENTATION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">ROW</span><span class="p">,</span><span class="w"> </span><span class="n">COMPRESSION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">NO</span><span class="p">)</span><span class="w"> </span><span class="n">NOCOMPRESS</span><span class="w"> </span><span class="n">DISTRIBUTE</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">HASH</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;author_id&quot;</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_p19932115143018"></p>
</li><li id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_li54496812315">If CREATE TABLE has a primary key index, DSC creates all unique indexes as common indexes based on GaussDB(DWS) features during migration.<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_p2341132311322"><a name="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_li54496812315"></a><a name="en-us_topic_0000001385792490_li54496812315"></a><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_b18341123193216">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_screen15341823123219"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span>
<span class="normal">8</span>
<span class="normal">9</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="o">`</span><span class="k">public</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">test_index_table01</span><span class="o">`</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">TABLE01_ID</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="p">(</span><span class="mi">11</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">TABLE01_THEME</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">AUTHOR_NAME</span><span class="o">`</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">AUTHOR_ID</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="p">(</span><span class="mi">11</span><span class="p">)</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">CREATE_TIME</span><span class="o">`</span><span class="w"> </span><span class="nb">INT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="p">(</span><span class="o">`</span><span class="n">TABLE01_ID</span><span class="o">`</span><span class="p">),</span>
<span class="w"> </span><span class="k">UNIQUE</span><span class="p">(</span><span class="o">`</span><span class="n">AUTHOR_ID</span><span class="o">`</span><span class="p">)</span>
<span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_p2342122310320"><strong id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_b1234272314321">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598644__en-us_topic_0000001385792490_screen14342023123219"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span>
<span class="normal">8</span>
<span class="normal">9</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;test_index_table01&quot;</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;table01_id&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;table01_theme&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">400</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;author_name&quot;</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">40</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;author_id&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;create_time&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;table01_id&quot;</span><span class="p">)</span>
<span class="p">)</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span><span class="n">ORIENTATION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">ROW</span><span class="p">,</span><span class="w"> </span><span class="n">COMPRESSION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">NO</span><span class="p">)</span><span class="w"> </span><span class="n">NOCOMPRESS</span><span class="w"> </span><span class="n">DISTRIBUTE</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">HASH</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;table01_id&quot;</span><span class="p">);</span>
<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">&quot;idx_test_index_table01_author_id&quot;</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;test_index_table01&quot;</span><span class="p">(</span><span class="ss">&quot;AUTHOR_ID&quot;</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
</li></ol>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_16_0166.html">Indexes</a></div>
</div>
</div>
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