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doc-exports/docs/dws/tool/dws_16_0137.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_0000001813438976"></a><a name="EN-US_TOPIC_0000001813438976"></a>
<h1 class="topictitle1">IF NOT EXISTS</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001813438976__en-us_topic_0000001398642140_p8060118">DSC supports the conversion of <strong id="EN-US_TOPIC_0000001813438976__en-us_topic_0000001398642140_b3347976407">IF NOT EXISTS</strong>, which is reserved during the migration.</p>
<p id="EN-US_TOPIC_0000001813438976__en-us_topic_0000001398642140_p712835684417"><strong id="EN-US_TOPIC_0000001813438976__en-us_topic_0000001398642140_b11771161610455">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813438976__en-us_topic_0000001398642140_screen964739124513"><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">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="o">`</span><span class="n">categories</span><span class="o">`</span><span class="p">;</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">categories</span><span class="o">`</span>
<span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">CategoryID</span><span class="o">`</span><span class="w"> </span><span class="n">tinyint</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span><span class="w"> </span><span class="n">unsigned</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="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="n">AUTO_INCREMENT</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">CategoryName</span><span class="o">`</span><span class="w"> </span><span class="nb">varchar</span><span class="p">(</span><span class="mi">15</span><span class="p">)</span><span class="w"> </span><span class="nb">CHARACTER</span><span class="w"> </span><span class="k">SET</span><span class="w"> </span><span class="n">utf8</span><span class="w"> </span><span class="k">COLLATE</span><span class="w"> </span><span class="n">utf8_unicode_ci</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="k">DEFAULT</span><span class="w"> </span><span class="s1">''</span><span class="w"> </span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">Description</span><span class="o">`</span><span class="w"> </span><span class="n">mediumtext</span><span class="w"> </span><span class="nb">CHARACTER</span><span class="w"> </span><span class="k">SET</span><span class="w"> </span><span class="n">utf8</span><span class="w"> </span><span class="k">COLLATE</span><span class="w"> </span><span class="n">utf8_unicode_ci</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="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">Picture</span><span class="o">`</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="nb">CHARACTER</span><span class="w"> </span><span class="k">SET</span><span class="w"> </span><span class="n">utf8</span><span class="w"> </span><span class="k">COLLATE</span><span class="w"> </span><span class="n">utf8_unicode_ci</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="k">DEFAULT</span><span class="w"> </span><span class="s1">''</span><span class="p">,</span>
<span class="w"> </span><span class="k">UNIQUE</span><span class="w"> </span><span class="p">(</span><span class="o">`</span><span class="n">CategoryID</span><span class="o">`</span><span class="p">)</span>
<span class="p">)</span><span class="n">ENGINE</span><span class="o">=</span><span class="n">InnoDB</span><span class="w"> </span><span class="n">AUTO_INCREMENT</span><span class="o">=</span><span class="mi">9</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="n">CHARSET</span><span class="o">=</span><span class="n">latin1</span><span class="p">;</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="o">`</span><span class="n">categories</span><span class="o">`</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813438976__en-us_topic_0000001398642140_p981414459"><strong id="EN-US_TOPIC_0000001813438976__en-us_topic_0000001398642140_b843718195457">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813438976__en-us_topic_0000001398642140_screen1156413104513"><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">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">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;categories&quot;</span><span class="p">;</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;categories&quot;</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;categoryid&quot;</span><span class="w"> </span><span class="n">SMALLSERIAL</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="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;categoryname&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">60</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="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">''</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;description&quot;</span><span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;picture&quot;</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><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">''</span>
<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">&quot;categoryid&quot;</span><span class="p">);</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">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;categories&quot;</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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