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doc-exports/docs/dws/tool/dws_16_0157.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_0000001860198729"></a><a name="EN-US_TOPIC_0000001860198729"></a>
<h1 class="topictitle1">LIKE (Table Cloning)</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001860198729__en-us_topic_0000001436175737_en-us_topic_0214164665_p17157194614820">In the MySQL database, you can use the <strong id="EN-US_TOPIC_0000001860198729__en-us_topic_0000001436175737_b102035483575">CREATE TABLE .. LIKE ..</strong> method to clone the old table structure to create a table. It is also supported by GaussDB(DWS). DSC will add additional table attribute information during migration.</p>
<p id="EN-US_TOPIC_0000001860198729__en-us_topic_0000001436175737_en-us_topic_0214164665_p66158450506"><strong id="EN-US_TOPIC_0000001860198729__en-us_topic_0000001436175737_en-us_topic_0214164665_b177164592506">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860198729__en-us_topic_0000001436175737_en-us_topic_0214164665_screen194633114518"><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="o">`</span><span class="k">public</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">runoob_tbl_old</span><span class="o">`</span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType_1</span><span class="o">`</span><span class="w"> </span><span class="k">YEAR</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType_2</span><span class="o">`</span><span class="w"> </span><span class="k">YEAR</span><span class="p">(</span><span class="mi">4</span><span class="p">),</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType_3</span><span class="o">`</span><span class="w"> </span><span class="k">YEAR</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'2018'</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType_4</span><span class="o">`</span><span class="w"> </span><span class="k">TIME</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</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="o">`</span><span class="n">runoob_tbl</span><span class="o">`</span><span class="w"> </span><span class="p">(</span><span class="k">like</span><span class="w"> </span><span class="o">`</span><span class="n">runoob_tbl_old</span><span class="o">`</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001860198729__en-us_topic_0000001436175737_en-us_topic_0214164665_p8060118"><strong id="EN-US_TOPIC_0000001860198729__en-us_topic_0000001436175737_en-us_topic_0214164665_b137575215519">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860198729__en-us_topic_0000001436175737_en-us_topic_0214164665_screen0945151925117"><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></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_old&quot;</span>
<span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;datatype_1&quot;</span><span class="w"> </span><span class="nb">SMALLINT</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype_2&quot;</span><span class="w"> </span><span class="nb">SMALLINT</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype_3&quot;</span><span class="w"> </span><span class="nb">SMALLINT</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'2018'</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype_4&quot;</span><span class="w"> </span><span class="k">TIME</span><span class="w"> </span><span class="k">WITHOUT</span><span class="w"> </span><span class="k">TIME</span><span class="w"> </span><span class="k">ZONE</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</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_1&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="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_tbl&quot;</span><span class="p">(</span><span class="w"> </span><span class="k">LIKE</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_tbl_old&quot;</span>
<span class="w"> </span><span class="k">INCLUDING</span><span class="w"> </span><span class="n">COMMENTS</span><span class="w"> </span><span class="k">INCLUDING</span><span class="w"> </span><span class="k">CONSTRAINTS</span><span class="w"> </span><span class="k">INCLUDING</span><span class="w"> </span><span class="k">DEFAULTS</span><span class="w"> </span><span class="k">INCLUDING</span><span class="w"> </span><span class="n">INDEXES</span><span class="w"> </span><span class="k">INCLUDING</span><span class="w"> </span><span class="k">STORAGE</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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