73 lines
3.9 KiB
HTML
73 lines
3.9 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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Requirements" />
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<meta name="abstract" content="Here are the principle requirements for join logical files." />
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<meta name="description" content="Here are the principle requirements for join logical files." />
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<meta name="DC.subject" content="join logical file, requirements" />
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<meta name="keywords" content="join logical file, requirements" />
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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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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Requirements</title>
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</head>
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<body id="rbaforjlfr"><a name="rbaforjlfr"><!-- --></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">Requirements</h1>
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<div><p>Here are the principle requirements for join logical
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files.</p>
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<div class="p"><ul><li>Each join logical file must have: <ul><li>Only one record format, with the JFILE keyword specified for it.</li>
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<li>At least two physical file names specified on the JFILE keyword. (The
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physical file names on the JFILE keyword do not have to be different files.)</li>
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<li>At least one join specification (J in position 17 with the JFLD keyword
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specified).</li>
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<li>A maximum of 255 secondary files.</li>
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<li>At least one field name with field use other than N (neither) at the field
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level.</li>
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</ul>
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</li>
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<li>If only two physical files are specified for the JFILE keyword, the JOIN
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keyword is not required. Only one join specification can be included, and
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it joins the two physical files.</li>
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<li>If more than two physical files are specified for the JFILE keyword, the
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following rules apply: <ul><li>The primary file must be the first file of the pair of files specified
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on the first JOIN keyword (the primary file can also be the first of the pair
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of files specified on other JOIN keywords). <div class="note"><span class="notetitle">Note:</span> Relative file numbers must
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be specified on the JOIN keyword and any JREF keyword when the same file name
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is specified twice on the JFILE keyword.</div>
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</li>
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<li>Every secondary file must be specified only once as the second file of
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the pair of files on the JOIN keyword. This means that for every secondary
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file on the JFILE keyword, one join specification must be included (two secondary
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files would mean two join specifications, three secondary files would mean
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three join specifications).</li>
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<li>The order in which secondary files appear in join specifications must
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match the order in which they are specified on the JFILE keyword.</li>
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</ul>
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</li>
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</ul>
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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="rbafosrjlf.htm" title="This is a summary of rules for joining database files.">Summary of rules</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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