92 lines
5.8 KiB
HTML
92 lines
5.8 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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Specify key fields from different files" />
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<meta name="abstract" content="A dynamic keyed sequence access path over a join logical file allows you to specify a processing sequence in which the keys can be in different physical files (DDS restricts the keys to the primary file)." />
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<meta name="description" content="A dynamic keyed sequence access path over a join logical file allows you to specify a processing sequence in which the keys can be in different physical files (DDS restricts the keys to the primary file)." />
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<meta name="DC.subject" content="specifying, key field, from different files, specifying from different files, example, specifying key fields, from different files" />
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<meta name="keywords" content="specifying, key field, from different files, specifying from different files, example, specifying key fields, from different files" />
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<meta name="DC.Relation" scheme="URI" content="rbafodynrs.htm" />
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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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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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>Specify key fields from different files</title>
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</head>
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<body id="rbafokfdf"><a name="rbafokfdf"><!-- --></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 key fields from different files</h1>
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<div><p>A dynamic keyed sequence access path over a join logical file allows
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you to specify a processing sequence in which the keys can be in different
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physical files (DDS restricts the keys to the primary file).</p>
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<p>The specification is identical to the previous method. The access path
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is specified using whatever key fields are required. There is no restriction
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on which physical file the key fields are in. However, if a key field exists
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in other than the primary file of a join specification, the system must make
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a temporary copy of the joined records. The system must also build a keyed
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sequence access path over the copied records before the query file is opened.
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The key fields must exist in the format identified on the FORMAT parameter.</p>
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<div class="section" id="rbafokfdf__rbafokfdfex1"><a name="rbafokfdf__rbafokfdfex1"><!-- --></a><h4 class="sectiontitle">Example: Specify key fields from different
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files</h4><p>This example shows how to use a field in a secondary file
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as a key field.</p>
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<p>Assume that you already have a join logical file named
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JOINLF. FILEX is specified as the primary file and is joined to FILEY. You
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want to process the records in JOINLF by the <em>Descrp</em> field which is
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in FILEY.</p>
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<p>Assume that the file record formats contain the
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following fields:</p>
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<table cellpadding="4" cellspacing="0" border="1" class="tableborder"><tr><td>
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<table cellpadding="4" cellspacing="0" summary="" width="100%" border="0"><thead align="left"><tr><th align="left" valign="bottom" width="33.33333333333333%" id="d0e50">FILEX</th>
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<th align="left" valign="bottom" width="33.33333333333333%" id="d0e52">FILEY</th>
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<th align="left" valign="bottom" width="33.33333333333333%" id="d0e54">JOINLF</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="d0e50 ">Item</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e52 ">Item</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e54 ">Item</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e50 ">Qty</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e52 ">Descrp</td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e54 ">Qty</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e50 "> </td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e52 "> </td>
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<td align="left" valign="top" width="33.33333333333333%" headers="d0e54 ">Descrp</td>
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</tr>
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</tbody>
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</table>
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</td></tr></table>
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<div class="p">You can specify: <pre>OVRDBF FILE(JOINLF) SHARE(*YES)
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OPNQRYF FILE(JOINLF) KEYFLD(DESCRP)
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CALL PGM(PGMC)
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CLOF OPNID(JOINLF)
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DLTOVR FILE(JOINLF)</pre>
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</div>
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<div class="p">If you want to arrange the records
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by <em>Qty</em> in <em>Descrp</em> (<em>Descrp</em> is the primary key field and <em>Qty</em> is
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a secondary key field) you can specify: <pre>OPNQRYF FILE(JOINLF) KEYFLD(DESCRP QTY)</pre>
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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="rbafodynrs.htm" title="Dynamic record selection allows you to request a subset of the records in a file without using data description specifications (DDS).">Select records without using DDS</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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