162 lines
8.7 KiB
HTML
162 lines
8.7 KiB
HTML
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<meta name="DC.Title" content="Specify the key field (example 1)" />
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<meta name="abstract" content="In this example, a logical file views records of two physical files through two different record formats: CLSHST (class history) and JOBHST (job history)." />
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<title>Specify the key field (example 1)</title>
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</head>
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<body id="logfileviewex"><a name="logfileviewex"><!-- --></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 1)</h1>
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<div><p>In this example, a logical file views records of two physical files
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through two different record formats: CLSHST (class history) and JOBHST (job
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history).</p>
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<div class="section"><p>In the logical file, the records from the two physical files can
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be merged together and sequenced by employee identification number (EMPNBR)
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by specifying EMPNBR in key position 1.</p>
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<div class="fignone" id="logfileviewex__cfig6"><a name="logfileviewex__cfig6"><!-- --></a><span class="figcap">Figure 1. Specify
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the key field (example 1)</span><pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R CLSHST PFILE(CLSHSTP)
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00020A K EMPNBR <span><span>1</span></span>
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00030A K CLSDTE <span><span>2</span></span>
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00040A*
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00050A R JOBHST PFILE(JOBHSTP)
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00060A K EMPNBR <span><span>1</span></span>
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00070A K JOBDTE <span><span>2</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="33.33333333333333%" id="d0e46">Record format</th>
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<th valign="top" width="33.33333333333333%" id="d0e48">Key positions</th>
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<th valign="top" width="33.33333333333333%" id="d0e50"> </th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="33.33333333333333%" headers="d0e46 "> </td>
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<td valign="top" width="33.33333333333333%" headers="d0e48 "><span>1</span></td>
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<td valign="top" width="33.33333333333333%" headers="d0e50 "><span>2</span></td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e46 ">CLSHST</td>
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<td valign="top" width="33.33333333333333%" headers="d0e48 ">EMPNBR</td>
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<td valign="top" width="33.33333333333333%" headers="d0e50 ">CLSDTE</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e46 ">JOBHST</td>
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<td valign="top" width="33.33333333333333%" headers="d0e48 ">EMPNBR</td>
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<td valign="top" width="33.33333333333333%" headers="d0e50 ">JOBDTE</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>All records that have the same key value for EMPNBR pertain to
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the same employee. To merge and sequence all records for a given employee
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into a single history of classes and job assignments, specify CLSDTE (date
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of class) and JOBDTE (date of job assignment) in key position 2 for the two
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record formats, as shown in the Using *NONE in the key field when creating
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a DDS file topic.</p>
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<p>Suppose that the job assignment dates and class dates
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are the dates (month/year) that the class or assignment started. Records for
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three students are retrieved in the following order:</p>
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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="20%" id="d0e87">EMPNBR</th>
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<th valign="top" width="20%" id="d0e89">CLSDTE</th>
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<th valign="top" width="20%" id="d0e91">JOBDTE</th>
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<th valign="top" width="40%" id="d0e93">Description</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="20%" headers="d0e87 ">1005</td>
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<td valign="top" width="20%" headers="d0e89 ">3/79</td>
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<td valign="top" width="20%" headers="d0e91 "> </td>
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<td valign="top" width="40%" headers="d0e93 ">Completed class</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1005</td>
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<td valign="top" width="20%" headers="d0e89 ">4/79</td>
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<td valign="top" width="20%" headers="d0e91 "> </td>
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<td valign="top" width="40%" headers="d0e93 ">Left to begin new job</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1005</td>
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<td valign="top" width="20%" headers="d0e89 "> </td>
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<td valign="top" width="20%" headers="d0e91 ">4/79</td>
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<td valign="top" width="40%" headers="d0e93 ">Completed job</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1005</td>
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<td valign="top" width="20%" headers="d0e89 ">6/79</td>
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<td valign="top" width="20%" headers="d0e91 "> </td>
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<td valign="top" width="40%" headers="d0e93 ">Completed class</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1006</td>
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<td valign="top" width="20%" headers="d0e89 "> </td>
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<td valign="top" width="20%" headers="d0e91 ">1/79</td>
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<td valign="top" width="40%" headers="d0e93 ">Completed job</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1006</td>
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<td valign="top" width="20%" headers="d0e89 "> </td>
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<td valign="top" width="20%" headers="d0e91 ">2/79</td>
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<td valign="top" width="40%" headers="d0e93 ">Completed job</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1006</td>
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<td valign="top" width="20%" headers="d0e89 ">3/79</td>
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<td valign="top" width="20%" headers="d0e91 "> </td>
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<td valign="top" width="40%" headers="d0e93 ">Completed class</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1006</td>
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<td valign="top" width="20%" headers="d0e89 ">5/79</td>
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<td valign="top" width="20%" headers="d0e91 "> </td>
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<td valign="top" width="40%" headers="d0e93 ">Transferred to new location</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1007</td>
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<td valign="top" width="20%" headers="d0e89 "> </td>
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<td valign="top" width="20%" headers="d0e91 ">1/79</td>
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<td valign="top" width="40%" headers="d0e93 ">Completed job</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1007</td>
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<td valign="top" width="20%" headers="d0e89 "> </td>
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<td valign="top" width="20%" headers="d0e91 ">4/79</td>
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<td valign="top" width="40%" headers="d0e93 ">Completed job</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1007</td>
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<td valign="top" width="20%" headers="d0e89 "> </td>
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<td valign="top" width="20%" headers="d0e91 ">7/79</td>
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<td valign="top" width="40%" headers="d0e93 ">Completed job</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e87 ">1007</td>
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<td valign="top" width="20%" headers="d0e89 ">8/79</td>
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<td valign="top" width="20%" headers="d0e91 "> </td>
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<td valign="top" width="40%" headers="d0e93 ">Left because of illness</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 above report provides a continuous history for each student.</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 class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="nonekeyfield.htm" title="Key fields having the same key position should not be compared under two conditions.">Use *NONE in the key field when creating a DDS file</a></div>
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</div>
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</div>
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</body>
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</html> |