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doc-exports/docs/dws/tool/dws_16_0083.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_0000001860198609"></a><a name="EN-US_TOPIC_0000001860198609"></a>
<h1 class="topictitle1">COMMENT</h1>
<div id="body32001227"><p id="EN-US_TOPIC_0000001860198609__en-us_topic_0000001434750221_p7905101612533">The figure below illustrates the process of simplifying <strong id="EN-US_TOPIC_0000001860198609__en-us_topic_0000001434750221_b791143219274">COMMENT</strong> statements. A complex statement is entered and then simplified through migration.</p>
<p id="EN-US_TOPIC_0000001860198609__en-us_topic_0000001434750221_p67491859133316"><strong id="EN-US_TOPIC_0000001860198609__en-us_topic_0000001434750221_b138424473217">Input:</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860198609__en-us_topic_0000001434750221_screen1749321717399"><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></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="n">MULTISET</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">PDAT</span><span class="p">.</span><span class="n">t_tbl_comment</span>
<span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="n">Data_Dt</span><span class="w"> </span><span class="nb">DATE</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="n">Data_Src</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">4</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="p">,</span><span class="n">List_Make_Stat</span><span class="w"> </span><span class="nb">CHAR</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="w"> </span>
<span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">INDEX</span><span class="p">(</span><span class="n">Data_Dt</span><span class="p">,</span><span class="n">Data_Src</span><span class="p">)</span><span class="w"> </span><span class="p">;</span>
<span class="k">COMMENT</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">PDAT</span><span class="p">.</span><span class="n">t_tbl_comment</span><span class="w"> </span><span class="k">IS</span><span class="w"> </span><span class="s1">'comment test on table'</span><span class="p">;</span>
<span class="c1">---------------</span>
<span class="k">REPLACE</span><span class="w"> </span><span class="k">VIEW</span><span class="w"> </span><span class="n">PVW</span><span class="p">.</span><span class="n">v_vw_comment</span><span class="w"> </span><span class="k">AS</span>
<span class="n">LOCKING</span><span class="w"> </span><span class="k">ROW</span><span class="w"> </span><span class="k">FOR</span><span class="w"> </span><span class="k">ACCESS</span>
<span class="k">SELECT</span><span class="w"> </span><span class="n">Data_Dt</span><span class="p">,</span><span class="w"> </span><span class="n">Data_Src</span><span class="p">,</span><span class="w"> </span><span class="n">List_Make_Stat</span><span class="w"> </span>
<span class="k">FROM</span><span class="w"> </span><span class="n">PDAT</span><span class="p">.</span><span class="n">t_tbl_comment</span><span class="p">;</span>
<span class="k">COMMENT</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">PVW</span><span class="p">.</span><span class="n">v_vw_comment</span><span class="w"> </span><span class="k">IS</span><span class="w"> </span><span class="s1">'comment test on view'</span><span class="p">;</span>
<span class="k">COMMENT</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">PVW</span><span class="p">.</span><span class="n">v_vw_comment</span><span class="p">.</span><span class="n">Data_Dt</span><span class="w"> </span><span class="k">IS</span><span class="w"> </span><span class="s1">'comment test on view column'</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001860198609__en-us_topic_0000001434750221_p1349431716399"><strong id="EN-US_TOPIC_0000001860198609__en-us_topic_0000001434750221_b1864518362272">Output:</strong></p>
<pre class="screen" id="EN-US_TOPIC_0000001860198609__en-us_topic_0000001434750221_screen1055095313526">COMMENT ON TABLE PDAT.t_tbl_comment IS 'comment test on table';
COMMENT ON VIEW PVW.v_vw_comment IS 'comment test on view';
COMMENT ON COLUMN PVW.v_vw_comment.Data_Dt IS 'comment test on view column';</pre>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_16_0036.html">Teradata Syntax Migration</a></div>
</div>
</div>
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