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doc-exports/docs/dws/tool/dws_16_0153.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_0000001813598820"></a><a name="EN-US_TOPIC_0000001813598820"></a>
<h1 class="topictitle1">WITH AS</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001813598820__en-us_topic_0000001398422534_p1976018713611">WITH AS is used in GaussDB(DWS) to declare one or more subqueries that can be referenced by name in the main query. It is equivalent to a temporary table. DSC supports this keyword, which is retained in the migration.</p>
<p id="EN-US_TOPIC_0000001813598820__en-us_topic_0000001398422534_p46401768376"><strong id="EN-US_TOPIC_0000001813598820__en-us_topic_0000001398422534_b1664013673712">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598820__en-us_topic_0000001398422534_screen364015611376"><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">WITH</span><span class="w"> </span><span class="n">e</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="n">city</span><span class="p">,</span><span class="w"> </span><span class="k">sum</span><span class="p">(</span><span class="n">population</span><span class="p">)</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">t1</span><span class="w"> </span><span class="k">group</span><span class="w"> </span><span class="k">by</span><span class="w"> </span><span class="n">city</span>
<span class="w"> </span><span class="p">),</span>
<span class="w"> </span><span class="n">d</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="k">max</span><span class="p">(</span><span class="n">music</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="n">max_music</span><span class="p">,</span><span class="w"> </span><span class="k">min</span><span class="p">(</span><span class="n">music</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="n">min_music</span><span class="w"> </span><span class="k">from</span><span class="w"> </span><span class="n">student</span>
<span class="w"> </span><span class="p">),</span>
<span class="w"> </span><span class="n">s</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">subject</span>
<span class="w"> </span><span class="p">)</span>
<span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">e</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813598820__en-us_topic_0000001398422534_p186401060379"><strong id="EN-US_TOPIC_0000001813598820__en-us_topic_0000001398422534_b664012693717">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813598820__en-us_topic_0000001398422534_screen96401763378"><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>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span>
<span class="normal">19</span>
<span class="normal">20</span>
<span class="normal">21</span>
<span class="normal">22</span>
<span class="normal">23</span>
<span class="normal">24</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">WITH</span><span class="w"> </span><span class="n">e</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="k">SELECT</span>
<span class="w"> </span><span class="n">city</span><span class="p">,</span><span class="w"> </span><span class="k">sum</span><span class="p">(</span><span class="n">population</span><span class="p">)</span>
<span class="w"> </span><span class="k">FROM</span>
<span class="w"> </span><span class="n">t1</span>
<span class="w"> </span><span class="k">GROUP</span><span class="w"> </span><span class="k">BY</span>
<span class="w"> </span><span class="n">city</span>
<span class="p">),</span>
<span class="n">d</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="k">SELECT</span>
<span class="w"> </span><span class="k">max</span><span class="p">(</span><span class="n">music</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="ss">&quot;max_music&quot;</span><span class="p">,</span><span class="w"> </span><span class="k">min</span><span class="p">(</span><span class="n">music</span><span class="p">)</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="ss">&quot;min_music&quot;</span>
<span class="w"> </span><span class="k">FROM</span>
<span class="w"> </span><span class="n">student</span>
<span class="p">),</span>
<span class="n">s</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="k">SELECT</span>
<span class="w"> </span><span class="o">*</span>
<span class="w"> </span><span class="k">FROM</span>
<span class="w"> </span><span class="n">subject</span>
<span class="p">)</span>
<span class="k">SELECT</span>
<span class="w"> </span><span class="o">*</span>
<span class="k">FROM</span>
<span class="w"> </span><span class="n">e</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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