87 lines
5.3 KiB
HTML
87 lines
5.3 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Inner join using JOIN syntax" />
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<meta name="abstract" content="To use the inner join syntax, both of the tables you are joining are listed in the FROM clause, along with the join condition that applies to the tables." />
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<meta name="description" content="To use the inner join syntax, both of the tables you are joining are listed in the FROM clause, along with the join condition that applies to the tables." />
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<meta name="DC.subject" content="SELECT statement, INNER JOIN, table, examples, INNER JOIN" />
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<meta name="keywords" content="SELECT statement, INNER JOIN, table, examples, INNER JOIN" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Inner join using JOIN syntax</title>
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</head>
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<body id="rbafyinsyn"><a name="rbafyinsyn"><!-- --></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">Inner join using JOIN syntax</h1>
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<div><p>To use the inner join syntax, both of the tables you are joining
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are listed in the FROM clause, along with the join condition that applies
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to the tables.</p>
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<div class="section"><p>The join condition is specified after the ON keyword and determines
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how the two tables are to be compared to each other to produce the join result.
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The condition can be any comparison operator; it does not need to be the equal
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operator. Multiple join conditions can be specified in the ON clause separated
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by the AND keyword. Any additional conditions that do not relate to the actual
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join are specified in either the WHERE clause or as part of the actual join
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in the ON clause. </p>
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<pre> <strong>SELECT</strong> EMPNO, LASTNAME, PROJNO
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<strong>FROM</strong> CORPDATA.EMPLOYEE <strong>INNER 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 class="section"><p>In this example, the join is done on the two tables using the
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EMPNO and RESPEMP columns from the tables. Since only employees that have
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last names starting with at least 'S' are to be returned, this additional
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condition is provided in the WHERE clause.</p>
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</div>
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<div class="section"><p>This query returns the following 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="d0e58">EMPNO</th>
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<th align="left" valign="bottom" width="33.33333333333333%" id="d0e60">LASTNAME</th>
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<th align="left" valign="bottom" width="33.33333333333333%" id="d0e62">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="d0e58 ">000250</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e60 ">SMITH</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e62 ">AD3112</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e58 ">000060</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e60 ">STERN</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e62 ">MA2110</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e58 ">000100</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e60 ">SPENSER</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e62 ">OP2010</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e58 ">000020</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e60 ">THOMPSON</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e62 ">PL2100</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>
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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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</div>
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</div>
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</body>
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</html>
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