yexinru/doc-exports
1
0
Fork 0
forked from docs/doc-exports
Code Pull Requests Activity
Files
a41a4e0331fbc0beff63bb28fa59228cc9a751df
doc-exports/docs/dws/tool/dws_16_0126.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

60 lines
7.1 KiB
HTML
Raw Blame History

<a name="EN-US_TOPIC_0000001813438824"></a><a name="EN-US_TOPIC_0000001813438824"></a>
<h1 class="topictitle1">CHECKSUM</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001813438824__en-us_topic_0000001385296890_en-us_topic_0214164589_p579713312318">In MySQL, <strong id="EN-US_TOPIC_0000001813438824__en-us_topic_0000001385296890_b129579190331822">CHECKSUM</strong> maintains a live checksum for all rows. GaussDB(DWS) does not support table definition modification using this attribute. DSC will delete the keyword during migration.</p>
<p id="EN-US_TOPIC_0000001813438824__en-us_topic_0000001385296890_en-us_topic_0214164589_p1752404014416"><strong id="EN-US_TOPIC_0000001813438824__en-us_topic_0000001385296890_en-us_topic_0214164589_b1763314499544">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813438824__en-us_topic_0000001385296890_en-us_topic_0214164589_screen287831351410"><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></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">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="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="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="w"> </span><span class="n">CHECKSUM</span><span class="o">=</span><span class="mi">1</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">CHECKSUM</span><span class="w"> </span><span class="mi">0</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">CHECKSUM</span><span class="o">=</span><span class="mi">0</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">CHECKSUM</span><span class="w"> </span><span class="mi">1</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">CHECKSUM</span><span class="o">=</span><span class="mi">1</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813438824__en-us_topic_0000001385296890_en-us_topic_0214164589_p12114173518210"><strong id="EN-US_TOPIC_0000001813438824__en-us_topic_0000001385296890_en-us_topic_0214164589_b184541816151717">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813438824__en-us_topic_0000001385296890_en-us_topic_0214164589_screen13766191113164"><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></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;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="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">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>
View Git Blame Copy Permalink