116 lines
6.9 KiB
HTML
116 lines
6.9 KiB
HTML
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<meta name="DC.Title" content="Exception join" />
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<meta name="abstract" content="A left exception join returns only the rows from the first table that do not have a match in the second table." />
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<meta name="description" content="A left exception join returns only the rows from the first table that do not have a match in the second table." />
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<meta name="DC.subject" content="SELECT statement, EXCEPTOIN JOIN, table, EXCEPTION JOIN, examples, EXCEPTION JOIN, exception join" />
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<title>Exception join</title>
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</head>
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<body id="rbafyexjo"><a name="rbafyexjo"><!-- --></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">Exception join</h1>
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<div><p>A left exception join returns only the rows from the first table
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that do <strong>not</strong> have a match in the second table. </p>
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<div class="section"><div class="p">Using the same tables as before, return those employees that are
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not responsible for any projects. <pre> <strong>SELECT</strong> EMPNO, LASTNAME, PROJNO
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<strong>FROM</strong> CORPDATA.EMPLOYEE <strong>EXCEPTION JOIN</strong> CORPDATA.PROJECT
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<strong>ON</strong> EMPNO = RESPEMP
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<strong>WHERE</strong> LASTNAME > 'S'</pre>
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</div>
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</div>
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<div class="section"><p>This join returns the output:</p>
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</div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="hsides" border="1" rules="all"><thead align="left"><tr><th align="left" valign="bottom" width="33.33333333333333%" id="d0e60">EMPNO</th>
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<th align="left" valign="bottom" width="33.33333333333333%" id="d0e62">LASTNAME</th>
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<th align="left" valign="bottom" width="33.33333333333333%" id="d0e64">PROJNO</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e60 ">000170</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e62 ">YOSHIMURA</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e64 ">-</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e60 ">000180</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e62 ">SCOUTTEN</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e64 ">-</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e60 ">000190</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e62 ">WALKER</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e64 ">-</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e60 ">000280</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e62 ">SCHNEIDER</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e64 ">-</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e60 ">000300</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e62 ">SMITH</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e64 ">-</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e60 ">000310</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e62 ">SETRIGHT</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e64 ">-</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e60 ">200170</td>
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<td valign="top" width="33.33333333333333%" headers="d0e62 ">YAMAMOTO</td>
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<td valign="top" width="33.33333333333333%" headers="d0e64 ">-</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e60 ">200280</td>
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<td valign="top" width="33.33333333333333%" headers="d0e62 ">SCHWARTZ</td>
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<td valign="top" width="33.33333333333333%" headers="d0e64 ">-</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e60 ">200310</td>
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<td valign="top" width="33.33333333333333%" headers="d0e62 ">SPRINGER</td>
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<td valign="top" width="33.33333333333333%" headers="d0e64 ">-</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e60 ">200330</td>
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<td valign="top" width="33.33333333333333%" headers="d0e62 ">WONG</td>
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<td valign="top" width="33.33333333333333%" headers="d0e64 ">-</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section"><div class="p">An exception join can also be written as a subquery using the
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NOT EXISTS predicate. The previous query can be rewritten in the following
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way: <pre> <strong>SELECT</strong> EMPNO, LASTNAME
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<strong>FROM</strong> CORPDATA.EMPLOYEE
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<strong>WHERE</strong> LASTNAME > 'S'
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<strong>AND NOT EXISTS</strong>
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(<strong>SELECT</strong> * <strong>FROM</strong> CORPDATA.PROJECT
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<strong>WHERE</strong> EMPNO = RESPEMP)</pre>
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</div>
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</div>
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<div class="section"><p>The only difference in this query is that it cannot return values
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from the PROJECT table.</p>
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</div>
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<div class="section"><p>There is a right exception join, too, that works just like a left
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exception join but with the tables reversed.</p>
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</div>
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</div>
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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="rbafyjoin.htm" title="Sometimes the information you want to see is not in a single table. To form a row of the result table, you might want to retrieve some column values from one table and some column values from another table. You can retrieve and join column values from two or more tables into a single row.">Join data from more than one table</a></div>
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</div>
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</div>
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</body>
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