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doc-exports/docs/dws/tool/dws_16_0181.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_0000001860198957"></a><a name="EN-US_TOPIC_0000001860198957"></a>
<h1 class="topictitle1">Division Expressions</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001860198957__en-us_topic_0000001442280317_p162131353125718">In MySQL, in a division expression, if the divisor is 0, null is returned. GaussDB(DWS) reports an error. Therefore, the division expression is converted by adding an if condition expression.</p>
<p id="EN-US_TOPIC_0000001860198957__en-us_topic_0000001442280317_p2021345315571"><strong id="EN-US_TOPIC_0000001860198957__en-us_topic_0000001442280317_b95474251051">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860198957__en-us_topic_0000001442280317_screen151011302057"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">select</span><span class="w"> </span><span class="k">sum</span><span class="p">(</span><span class="n">c1</span><span class="p">)</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">c2</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="k">result</span><span class="w"> </span><span class="k">from</span><span class="w"> </span><span class="n">table_t1</span><span class="p">;</span>
<span class="k">select</span><span class="w"> </span><span class="k">sum</span><span class="p">(</span><span class="n">c1</span><span class="p">)</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="k">count</span><span class="w"> </span><span class="p">(</span><span class="n">c3</span><span class="o">/</span><span class="n">c4</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="k">result</span><span class="w"> </span><span class="k">from</span><span class="w"> </span><span class="n">table_t1</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001860198957__en-us_topic_0000001442280317_p921318531577"><strong id="EN-US_TOPIC_0000001860198957__en-us_topic_0000001442280317_b2100163316513">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860198957__en-us_topic_0000001442280317_screen199374362514"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="p">(</span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">c2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="k">null</span><span class="p">,</span><span class="w"> </span><span class="k">sum</span><span class="p">(</span><span class="n">c1</span><span class="p">)</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">c2</span><span class="p">))</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="ss">&quot;result&quot;</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">table_t1</span><span class="p">;</span>
<span class="k">SELECT</span><span class="w"> </span><span class="p">(</span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="k">count</span><span class="p">(</span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">c4</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="k">null</span><span class="p">,</span><span class="w"> </span><span class="n">c3</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">c4</span><span class="p">))</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="k">null</span><span class="p">,</span><span class="w"> </span><span class="k">sum</span><span class="p">(</span><span class="n">c1</span><span class="p">)</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="k">count</span><span class="p">(</span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">c4</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="k">null</span><span class="p">,</span><span class="w"> </span><span class="n">c3</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">c4</span><span class="p">))))</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="ss">&quot;result&quot;</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">table_t1</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_0177.html">Data Manipulation Language (DML)</a></div>
</div>
</div>
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