134 lines
7.0 KiB
HTML
134 lines
7.0 KiB
HTML
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<meta name="DC.Title" content="Specify the key field (example 3)" />
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<meta name="abstract" content="In this example, consider a logical employee file over five physical files." />
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<meta name="description" content="In this example, consider a logical employee file over five physical files." />
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<title>Specify the key field (example 3)</title>
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<body id="logfileviewex3"><a name="logfileviewex3"><!-- --></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">Specify the key field (example 3)</h1>
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<div><p>In this example, consider a logical employee file over five physical
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files.</p>
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<div class="example"> <div class="fignone" id="logfileviewex3__cfig8"><a name="logfileviewex3__cfig8"><!-- --></a><span class="figcap">Figure 1. Specify the key field (example 3)</span><pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R EMPMST PFILE(EMPMSTP)
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00020A K EMPNBR <span><span>1</span></span>
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00030A*
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00040A R CLSREG PFILE(CLSREGP)
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00050A K EMPNBR <span><span>1</span></span>
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00060A K CLSDTE <span><span>2</span></span>
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00070A*
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00080A R CLSHST PFILE(CLSHSTP)
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00090A K EMPNBR <span><span>1</span></span>
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00100A K CLSDTE <span><span>2</span></span>
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00110A*
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00120A R JOBHST PFILE(JOBHSTP)
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00130A K EMPNBR <span><span>1</span></span>
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00140A K *NONE <span><span>2</span></span>
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00150A K JOBDTE <span><span>3</span></span>
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00160A*
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00170A R ACTHST PFILE(ACTHSTP)
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00180A K EMPNBR <span><span>1</span></span>
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00190A K *NONE <span><span>2</span></span>
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00200A K ACTDTE <span><span>3</span></span>
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A</pre>
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</div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="void" border="0" rules="none"><thead align="left"><tr><th valign="top" width="25%" id="d0e71">Record format</th>
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<th valign="top" width="25%" id="d0e73">Key positions</th>
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<th valign="top" width="25%" id="d0e75"> </th>
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<th valign="top" width="25%" id="d0e76"> </th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="25%" headers="d0e71 "> </td>
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<td valign="top" width="25%" headers="d0e73 "><span>1</span></td>
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<td valign="top" width="25%" headers="d0e75 "><span>2</span></td>
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<td valign="top" width="25%" headers="d0e76 "><span>3</span></td>
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</tr>
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<tr><td valign="top" width="25%" headers="d0e71 ">EMPMST</td>
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<td valign="top" width="25%" headers="d0e73 ">EMPNBR</td>
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<td valign="top" width="25%" headers="d0e75 ">*NONE</td>
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<td valign="top" width="25%" headers="d0e76 ">*NONE</td>
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</tr>
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<tr><td valign="top" width="25%" headers="d0e71 ">CLSREG</td>
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<td valign="top" width="25%" headers="d0e73 ">EMPNBR</td>
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<td valign="top" width="25%" headers="d0e75 ">CLSDTE</td>
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<td valign="top" width="25%" headers="d0e76 ">*NONE</td>
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</tr>
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<tr><td valign="top" width="25%" headers="d0e71 ">CLSHST</td>
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<td valign="top" width="25%" headers="d0e73 ">EMPNBR</td>
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<td valign="top" width="25%" headers="d0e75 ">CLSDTE</td>
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<td valign="top" width="25%" headers="d0e76 ">*NONE</td>
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</tr>
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<tr><td valign="top" width="25%" headers="d0e71 ">JOBHST</td>
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<td valign="top" width="25%" headers="d0e73 ">EMPNBR</td>
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<td valign="top" width="25%" headers="d0e75 ">*NONE</td>
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<td valign="top" width="25%" headers="d0e76 ">JOBDTE</td>
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</tr>
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<tr><td valign="top" width="25%" headers="d0e71 ">ACTHST</td>
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<td valign="top" width="25%" headers="d0e73 ">EMPNBR</td>
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<td valign="top" width="25%" headers="d0e75 ">*NONE</td>
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<td valign="top" width="25%" headers="d0e76 ">ACTDTE</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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<p>The records are merged and sequenced as follows:</p>
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<ol><li>All records are merged and sequenced by employee number.</li>
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<li>For a given employee, records are sequenced by: <ol type="a"><li>The master record (of the EMPMST format)</li>
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<li>Records of the CLSREG and CLSHST formats, merged and sequenced together
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on values of CLSDTE (key position 2)</li>
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<li>Records of the JOBHST and ACTHST formats, merged together and sequenced
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together on values of JOBDTE and ACTDTE (key position 3)</li>
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</ol>
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</li>
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</ol>
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<div class="p">Specifying *NONE in the key definitions achieves this sequencing as
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follows: <ul><li>*NONE and a field name, CLSDTE, appear in the second key position of the
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adjacent formats, CLSHST and JOBHST. This effectively causes a split between
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the two formats after the preceding key position (position 1). Records of
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formats above the split are merged and sequenced with records of formats below
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the split only on values of EMPNBR.</li>
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<li>An implicit *NONE in the second key position of the format EMPMST forces
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a similar split.</li>
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<li>With *NONE in key position 2, the JOBHST and ACTHST formats form a set
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in which the values of JOBDTE and ACTDTE are compared in order to merge and
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sequence records of these two formats only.</li>
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</ul>
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</div>
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<div class="p">The record sequence defined by the previous key specifications
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is totally dependent on the order in which the formats are specified. For
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example, if JOBHST is specified before CLSHST, key position 2 will read: <pre>*NONE, CLSDTE, *NONE, CLSDTE, *NONE</pre>
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</div>
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<p>Here,
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the values of CLSDTE within CLSREG will not be sequenced with the values of
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CLSDTE within CLSHST, and JOBDTE will not be sequenced with ACTDTE.</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="lkeynm.htm" title="When you specify K in position 17, the name specified in positions 19 through 28 is a key field name.">Key field name</a></div>
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</div>
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</div>
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</body>
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