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doc-exports/docs/dws/tool/dws_16_0113.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_0000001813598588"></a><a name="EN-US_TOPIC_0000001813598588"></a>
<h1 class="topictitle1">Set Types</h1>
<div id="body8662426"><div class="section" id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_section164812323252"><h4 class="sectiontitle">Overview</h4><ol id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164602_ol165921580410"><li id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164602_li959275819413">In MySQL, an ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation.</li><li id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164602_li2083411211510">A SET is a string object that can have zero or more values, each of which must be chosen from a list of permitted values specified when the table is created.</li></ol>
</div>
<div class="section" id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_section1448194415256"><h4 class="sectiontitle">Type Mapping</h4>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_table10307949615" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Set type mapping</caption><thead align="left"><tr id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_row83071941461"><th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.2.4.1.1"><p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p230710412620">MySQL Set Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.2.4.1.2"><p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p12307141365">MySQL INPUT</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.2.4.1.3"><p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p1030714262">GaussDB(DWS) OUTPUT</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_row2307945620"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p9307341361">ENUM</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p9307541619">ENUM</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p43071441662">VARCHAR</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_row153085420614"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p4308114562">SET</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p3308841666">SET</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p173083420617">VARCHAR</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="note" id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164385_note1544699172110"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_ul437662813153"><li id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_li237602801512">The ENUM type is transformed into the VARCHAR type, with a precision quadruple the length of the longest enumeration. The CHECK() function validates the accuracy of the entered values.</li><li id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_li1437702815152">The SET type is converted to the VARCHAR type. The precision is four times the sum of the length of each enumerated value field and the number of separators.</li></ul>
</div></div>
<p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p10251501083"><strong id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_b86542326231717">Input: ENUM</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_screen198514121388"><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></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="n">runoob_dataType_test</span><span class="o">`</span><span class="p">(</span>
<span class="w"> </span><span class="n">id</span><span class="w"> </span><span class="nb">int</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="w"> </span><span class="o">`</span><span class="n">dataType_17</span><span class="o">`</span><span class="w"> </span><span class="n">ENUM</span><span class="p">(</span><span class="s1">'dws-1'</span><span class="p">,</span><span class="w"> </span><span class="s1">'dws-2'</span><span class="p">,</span><span class="w"> </span><span class="s1">'dws-3'</span><span class="p">)</span>
<span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p203432231188"><strong id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_b195396311081">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_screen1871773318816"><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">INTEGER</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="w"> </span><span class="ss">&quot;datatype_17&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">20</span><span class="p">)</span><span class="w"> </span><span class="k">CHECK</span><span class="w"> </span><span class="p">(</span><span class="n">dataType_17</span><span class="w"> </span><span class="k">IN</span><span class="p">(</span><span class="s1">'dws-1'</span><span class="p">,</span><span class="s1">'dws-2'</span><span class="p">,</span><span class="s1">'dws-3'</span><span class="p">,</span><span class="s1">''</span><span class="p">,</span><span class="w"> </span><span class="k">null</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;id&quot;</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p996313591480"><strong id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_b86536782031717">Input: SET</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_screen1010119234919"><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></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="n">runoob_tbl_test</span><span class="o">`</span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType_18</span><span class="o">`</span><span class="w"> </span><span class="k">SET</span><span class="p">(</span><span class="s1">'dws-1'</span><span class="p">,</span><span class="w"> </span><span class="s1">'dws-2'</span><span class="p">,</span><span class="w"> </span><span class="s1">'dws-3'</span><span class="p">)</span>
<span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_p14992203111018"><strong id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_b105611011121019">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598588__en-us_topic_0000001433628841_en-us_topic_0214164519_screen6915144108"><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></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_tbl_test&quot;</span>
<span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;datatype_18&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">68</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;datatype_18&quot;</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_16_0106.html">Data Types</a></div>
</div>
</div>
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