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Lu, Huayi 27019c2991 DWS TOOL 830.201 version 
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: Lu, Huayi <luhuayi@huawei.com>
Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
2024-05-16 07:35:25 +00:00

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<a name="EN-US_TOPIC_0000001772536444"></a><a name="EN-US_TOPIC_0000001772536444"></a>
<h1 class="topictitle1">COLUMN STORE</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001772536444__en-us_topic_0000001706223917_en-us_topic_0000001384550472_p62901243181810">The table orientation can be converted from ROW-STORE to COLUMN store using the WITH (ORIENTATION=COLUMN) in the CREATE TABLE statement. This feature can be enabled/disabled using the <a href="dws_16_0014.html#EN-US_TOPIC_0000001819416085__en-us_topic_0000001706224349_en-us_topic_0000001432527901_li1639915513325">rowstoreToColumnstore</a> configuration parameter.</p>
<p id="EN-US_TOPIC_0000001772536444__en-us_topic_0000001706223917_en-us_topic_0000001384550472_p21541344193614"><strong id="EN-US_TOPIC_0000001772536444__en-us_topic_0000001706223917_en-us_topic_0000001384550472_b0585838175020">Input: CREATE TABLE with change orientation to COLUMN STORE</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001772536444__en-us_topic_0000001706223917_en-us_topic_0000001384550472_screen2070885410118"><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></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">VOLATILE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">tab1</span>
<span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">c1</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">30</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">UNICODE</span><span class="w"> </span>
<span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="n">c2</span><span class="w"> </span><span class="nb">DATE</span>
<span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="p">...</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="w"> </span><span class="p">(</span><span class="n">c1</span><span class="p">,</span><span class="w"> </span><span class="n">c2</span><span class="p">)</span><span class="w"> </span>
<span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="k">COMMIT</span><span class="w"> </span><span class="k">PRESERVE</span><span class="w"> </span><span class="k">ROWS</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001772536444__en-us_topic_0000001706223917_en-us_topic_0000001384550472_p5739105412113"><strong id="EN-US_TOPIC_0000001772536444__en-us_topic_0000001706223917_en-us_topic_0000001384550472_b3844840145010">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001772536444__en-us_topic_0000001706223917_en-us_topic_0000001384550472_screen373911542118"><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></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">LOCAL</span><span class="w"> </span><span class="k">TEMPORARY</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">tab1</span><span class="w"> </span>
<span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">c1</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">30</span><span class="p">)</span><span class="w"> </span>
<span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="n">c2</span><span class="w"> </span><span class="nb">DATE</span><span class="w"> </span>
<span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="p">...</span>
<span class="w"> </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">COLUMN</span><span class="p">)</span>
<span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="k">COMMIT</span><span class="w"> </span><span class="k">PRESERVE</span><span class="w"> </span><span class="k">ROWS</span><span class="w"> </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="n">c1</span><span class="p">,</span><span class="w"> </span><span class="n">c2</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_0061.html">Migrating Tables</a></div>
</div>
</div>
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