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doc-exports/docs/dws/tool/dws_16_0122.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_0000001813439100"></a><a name="EN-US_TOPIC_0000001813439100"></a>
<h1 class="topictitle1">AUTO_INCREMENT</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_p48341613162011">In database application, unique numbers that increase automatically are needed to identify records. In MySQL, the <strong id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_b99954976132331">AUTO_INCREMENT</strong> attribute of a data column can be used to automatically generate the numbers. When creating a table, you can use <strong id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_b7674789032331">AUTO_INCREMENT=</strong><em id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_i37129044132331">n</em> to specify a start value. You can also use the <strong id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_b169406172032331">ALTER TABLE </strong><em id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_i67596692132331">TABLE_NAME</em><strong id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_b137749725732331"> AUTO_INCREMENT=</strong><em id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_i65815891032331">n</em> command to reset the start value. GaussDB(DWS) does not support this parameter. During DSC migration, the columns with this attribute set are migrated to the SERIAL type, and the keyword is deleted. The following <a href="#EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_table10533101812314">Table</a> describes the conversion:</p>
<div class="tablenoborder"><a name="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_table10533101812314"></a><a name="en-us_topic_0000001435896181_table10533101812314"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_table10533101812314" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Data type conversion</caption><thead align="left"><tr id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_row135331218103115"><th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.4.1.1"><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p17533101813116">MySQL Numeric Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.4.1.2"><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p1653310187316">MySQL INPUT</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.4.1.3"><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p85341518193115">GaussDB(DWS) OUTPUT</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_row1753451813116"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p253401811312">TINYINT</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p653481893112">TINYINT</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p1534181833118">SMALLSERIAL</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_row45341118103120"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p1853413183315">SMALLINT</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p135341318163117">SMALLINT UNSIGNED</p>
<p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p16287125823317">SMALLINT</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p1453414188312">SERIAL</p>
<p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p16194016113416">SMALLSERIAL</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_row155344187311"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p853491823116">DOUBLE/FLOAT</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p1353412182310">DOUBLE/FLOAT</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p17534151823116">BIGSERIAL</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_row85341918153111"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p1653431818314">INT/INTEGER</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p199405433510">INT/INTEGER UNSIGNED</p>
<p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p8868553614">INT/INTEGER</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p10763121673611">BIGSERIAL</p>
<p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p1677151815367">SERIAL</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_row1553413185313"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p6534418113112">BIGINT/SERIAL</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p364217703716">BIGINT/SERIAL</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_p1353411180311">BIGSERIAL</p>
</td>
</tr>
</tbody>
</table>
</div>
<p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_p6645131502215"><strong id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_b6512225193817">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_screen41228368223"><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></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">job_instance</span><span class="o">`</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">job_sche_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="w"> </span><span class="n">AUTO_INCREMENT</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">task_name</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">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">''</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="o">`</span><span class="n">job_sche_id</span><span class="o">`</span><span class="p">)</span>
<span class="p">)</span><span class="w"> </span><span class="n">ENGINE</span><span class="o">=</span><span class="n">InnoDB</span><span class="w"> </span><span class="n">AUTO_INCREMENT</span><span class="o">=</span><span class="mi">219</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>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_p1523917273222"><strong id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_b690518362380">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_screen1489394112228"><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;job_instance&quot;</span>
<span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;job_sche_id&quot;</span><span class="w"> </span><span class="nb">SERIAL</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;task_name&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">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">''</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;job_sche_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;job_sche_id&quot;</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_p7586132133119">In addition, GaussDB(DWS) does not support table definition modification using the <strong id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_b141047312393">AUTO_INCREMENT</strong> attribute. DSC will delete this attribute during migration.</p>
<p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_p15219154320327"><strong id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_b208996209548">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_screen1725735293216"><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="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="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</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">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="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="p">(</span><span class="o">`</span><span class="n">dataType1</span><span class="o">`</span><span class="p">)</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="n">AUTO_INCREMENT</span><span class="w"> </span><span class="mi">100</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="n">AUTO_INCREMENT</span><span class="o">=</span><span class="mi">100</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_p10773347173215"><strong id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_b1388842385419">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813439100__en-us_topic_0000001435896181_en-us_topic_0214164775_screen143081457173210"><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="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">SERIAL</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;datatype2&quot;</span><span class="w"> </span><span class="nb">REAL</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;datatype1&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;datatype1&quot;</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_16_0119.html">Table (Optional Parameters and Operations)</a></div>
</div>
</div>
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