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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
5.3 KiB
HTML
38 lines
5.3 KiB
HTML
<a name="EN-US_TOPIC_0000001813439000"></a><a name="EN-US_TOPIC_0000001813439000"></a>
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<h1 class="topictitle1">CLUSTERED KEY</h1>
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<div id="body8662426"><p id="EN-US_TOPIC_0000001813439000__en-us_topic_0000001447330941_p8060118">It is a clustered index in ADB that defines the sorting sequence in a table. The logical sequence of key values in a clustered index determines the physical sequence of rows in the table. GaussDB(DWS) does not support table definition modification using this attribute. DSC will delete the keyword during migration.</p>
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<p id="EN-US_TOPIC_0000001813439000__en-us_topic_0000001447330941_p239011217817"><strong id="EN-US_TOPIC_0000001813439000__en-us_topic_0000001447330941_b163314112814">Input</strong></p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813439000__en-us_topic_0000001447330941_screen860331891013"><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">DROP</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">EXISTS</span><span class="w"> </span><span class="n">unsupport_parse_test</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="o">`</span><span class="n">unsupport_parse_test</span><span class="o">`</span><span class="w"> </span><span class="p">(</span>
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<span class="w"> </span><span class="o">`</span><span class="n">username</span><span class="o">`</span><span class="w"> </span><span class="nb">int</span><span class="p">,</span>
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<span class="w"> </span><span class="n">clustered</span><span class="w"> </span><span class="k">key</span><span class="w"> </span><span class="n">clustered_key</span><span class="p">(</span><span class="n">shopid</span><span class="w"> </span><span class="k">ASC</span><span class="p">,</span><span class="w"> </span><span class="n">datetype</span><span class="w"> </span><span class="k">ASC</span><span class="p">)</span>
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<span class="p">);</span>
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<span class="k">DROP</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">EXISTS</span><span class="w"> </span><span class="n">unsupport_parse_test</span><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_0000001813439000__en-us_topic_0000001447330941_p057475482"><strong id="EN-US_TOPIC_0000001813439000__en-us_topic_0000001447330941_b91981142811">Output</strong></p>
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<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813439000__en-us_topic_0000001447330941_screen1090715309105"><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">DROP</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">EXISTS</span><span class="w"> </span><span class="ss">"public"</span><span class="p">.</span><span class="ss">"unsupport_parse_test"</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="ss">"public"</span><span class="p">.</span><span class="ss">"unsupport_parse_test"</span><span class="w"> </span><span class="p">(</span>
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<span class="w"> </span><span class="ss">"username"</span><span class="w"> </span><span class="nb">INTEGER</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">"username"</span><span class="p">);</span>
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<span class="k">DROP</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">EXISTS</span><span class="w"> </span><span class="ss">"public"</span><span class="p">.</span><span class="ss">"unsupport_parse_test"</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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