56 lines
3.6 KiB
HTML
56 lines
3.6 KiB
HTML
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<meta name="abstract" content="You can use a shorthand method of defining join conditions with the USING clause. The USING clause is equivalent to a join condition where each column from the left table is compared to a column with the same name in the right table." />
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<title>Join data with the USING clause</title>
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<body id="rbafyjoinusing"><a name="rbafyjoinusing"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Join data with the USING clause</h1>
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<div><p>You can use a shorthand method of defining join conditions with
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the USING clause. The USING clause is equivalent to a join condition where
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each column from the left table is compared to a column with the same name
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in the right table.</p>
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<div class="section"><p>For example, look at the USING clause in this statement:</p>
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<pre><strong>SELECT</strong> EMPNO, ACSTDATE
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<strong>FROM</strong> CORPDATA.PROJACT <strong>INNER JOIN</strong> CORPDATA.EMPPROJACT
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<strong>USING</strong> (PROJNO, ACTNO)
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<strong>WHERE</strong> ACSDATE > '1982-12-31';</pre>
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<p>The syntax in
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this statement is valid and equivalent to the join condition in the following
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statement:</p>
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<pre><strong>SELECT</strong> EMPNO, ACSTDATE
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<strong>FROM</strong> CORPDATA.PROJACT <strong>INNER JOIN</strong> CORPDATA.EMPPROJACT
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<strong>ON</strong> CORPDATA.PROJACT.PROJNO = CORPDATA.EMPPROJACT.PROJNO <strong>AND</strong>
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CORPDATA.PROJACT.ACTNO = CORPDATA.EMPPROJACT.ACTNO
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<strong>WHERE</strong> ACSTDATE > '1982-12-31';</pre>
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</div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafyinj.htm" title="An inner join returns only the rows from each table that have matching values in the join columns. Any rows that do not have a match between the tables will not appear in the result table.">Inner join</a></div>
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