109 lines
5.6 KiB
HTML
109 lines
5.6 KiB
HTML
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<meta name="DC.Title" content="Match records in primary and secondary files (case 1)" />
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<title>Match records in primary and secondary files (case 1)</title>
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</head>
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<body id="rbafocas1m"><a name="rbafocas1m"><!-- --></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">Match records in primary and secondary files (case 1)</h1>
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<div><div class="section"><p>Assume that a join logical file is specified as in <a href="rbafox2phyf.htm#rbafox2phyf">Basic concepts of joining two physical files (example 1)</a>,
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and four records are contained in both PF1 and PF2, as shown in the following
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two tables.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 1. Physical file 1 (PF1)</caption><thead align="left"><tr valign="bottom"><th valign="bottom" id="d0e33">Employee number</th>
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<th valign="bottom" id="d0e35">Name</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e33 ">235</td>
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<td valign="top" headers="d0e35 ">Anne</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">440</td>
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<td valign="top" headers="d0e35 ">Doug</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">500</td>
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<td valign="top" headers="d0e35 ">Mark</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">729</td>
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<td valign="top" headers="d0e35 ">Sue</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="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 2. Physical file 2 (PF2)</caption><thead align="left"><tr valign="bottom"><th valign="bottom" id="d0e66">Employee number</th>
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<th valign="bottom" id="d0e68">Salary</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e66 ">235</td>
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<td valign="top" headers="d0e68 ">1700.00</td>
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</tr>
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<tr><td valign="top" headers="d0e66 ">440</td>
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<td valign="top" headers="d0e68 ">950.50</td>
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</tr>
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<tr><td valign="top" headers="d0e66 ">500</td>
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<td valign="top" headers="d0e68 ">2100.00</td>
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</tr>
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<tr><td valign="top" headers="d0e66 ">729</td>
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<td valign="top" headers="d0e68 ">1400.90</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 class="section"><p>The program does four read operations and gets the following records.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 3. Join logical file (JLF)</caption><thead align="left"><tr valign="bottom"><th valign="bottom" width="33.33333333333333%" id="d0e103">Employee number</th>
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<th valign="bottom" width="33.33333333333333%" id="d0e105">Name</th>
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<th valign="bottom" width="33.33333333333333%" id="d0e107">Salary</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="33.33333333333333%" headers="d0e103 ">235</td>
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<td valign="top" width="33.33333333333333%" headers="d0e105 ">Anne</td>
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<td valign="top" width="33.33333333333333%" headers="d0e107 ">1700.00</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e103 ">440</td>
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<td valign="top" width="33.33333333333333%" headers="d0e105 ">Doug</td>
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<td valign="top" width="33.33333333333333%" headers="d0e107 ">950.50</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e103 ">500</td>
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<td valign="top" width="33.33333333333333%" headers="d0e105 ">Mark</td>
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<td valign="top" width="33.33333333333333%" headers="d0e107 ">2100.00</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e103 ">729</td>
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<td valign="top" width="33.33333333333333%" headers="d0e105 ">Sue</td>
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<td valign="top" width="33.33333333333333%" headers="d0e107 ">1400.90</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>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafox2phyf.htm" title="A join logical file is a logical file that combines (in one record format) fields from two or more physical files because in the record format not all the fields need to exist in all the physical files.">Basic concepts of joining two physical files (example 1)</a></div>
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</div>
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</div>
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</body>
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