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luhuayi
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Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: luhuayi <luhuayi@huawei.com> Co-committed-by: luhuayi <luhuayi@huawei.com>
38 lines
5.2 KiB
HTML
38 lines
5.2 KiB
HTML
<a name="EN-US_TOPIC_0000001860318565"></a><a name="EN-US_TOPIC_0000001860318565"></a>
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<h1 class="topictitle1">FOREIGN_KEY_CHECKS</h1>
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<div id="body8662426"><p id="EN-US_TOPIC_0000001860318565__en-us_topic_0000001449512505_p8060118">For foreign key constraints in MySQL, GaussDB(DWS) does not support them modifying table definition. They will be deleted during DSC migration.</p>
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<p id="EN-US_TOPIC_0000001860318565__en-us_topic_0000001449512505_p136041758101119"><strong id="EN-US_TOPIC_0000001860318565__en-us_topic_0000001449512505_b077417395253">Input</strong></p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860318565__en-us_topic_0000001449512505_screen2088154513254"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<span class="normal">5</span>
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<span class="normal">6</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SET</span><span class="w"> </span><span class="n">foreign_key_checks</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
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<span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">mall_order_dc</span><span class="w"> </span><span class="p">(</span>
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<span class="w"> </span><span class="n">id</span><span class="w"> </span><span class="nb">bigint</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>
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<span class="w"> </span><span class="n">order_id</span><span class="w"> </span><span class="nb">varchar</span><span class="p">(</span><span class="mi">50</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>
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<span class="w"> </span><span class="k">key</span><span class="w"> </span><span class="n">order_id</span><span class="p">(</span><span class="n">order_id</span><span class="p">)</span>
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<span class="p">);</span>
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</pre></div></td></tr></table></div>
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</div>
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<p id="EN-US_TOPIC_0000001860318565__en-us_topic_0000001449512505_p97061333162516"><strong id="EN-US_TOPIC_0000001860318565__en-us_topic_0000001449512505_b19207642172510">Output</strong></p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860318565__en-us_topic_0000001449512505_screen597254913252"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">2</span>
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<span class="normal">3</span>
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<span class="normal">4</span>
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<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="ss">"public"</span><span class="p">.</span><span class="ss">"mall_order_dc"</span><span class="w"> </span><span class="p">(</span>
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<span class="w"> </span><span class="ss">"id"</span><span class="w"> </span><span class="n">BIGSERIAL</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
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<span class="w"> </span><span class="ss">"order_id"</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span>
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<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">"id"</span><span class="p">);</span>
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<span class="k">CREATE</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="ss">"order_id"</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="ss">"public"</span><span class="p">.</span><span class="ss">"mall_order_dc"</span><span class="w"> </span><span class="k">USING</span><span class="w"> </span><span class="n">BTREE</span><span class="w"> </span><span class="p">(</span><span class="ss">"order_id"</span><span class="p">);</span>
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</pre></div></td></tr></table></div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_16_0119.html">Table (Optional Parameters and Operations)</a></div>
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</div>
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</div>
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