61 lines
3.5 KiB
HTML
61 lines
3.5 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 name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Join fields" />
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<meta name="abstract" content="Here are the rules for join fields." />
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<meta name="description" content="Here are the rules for join fields." />
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<meta name="DC.subject" content="join field, rules to remember, field, join" />
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<meta name="keywords" content="join field, rules to remember, field, join" />
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<meta name="DC.Relation" scheme="URI" content="rbafosrjlf.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafoappmax.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.Identifier" content="rbaforjlfjf" />
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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>Join fields</title>
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</head>
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<body id="rbaforjlfjf"><a name="rbaforjlfjf"><!-- --></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">Join fields</h1>
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<div><p>Here are the rules for join fields.</p>
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<div class="p"><ul><li>Every physical file you join must be joined to another physical
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file by at least one join field. A join field is a field specified as a parameter
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value on the JFLD keyword in a join specification.</li>
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<li>Join fields (specified on the JFLD keyword) must have identical attributes
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(length, data type, and decimal positions) or be redefined in the record format
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of the join logical file to have the same attributes. If the join fields are
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of character type, the field lengths might be different.</li>
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<li>Join fields need not be specified in the record format of the join logical
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file (unless you must redefine one or both so that their attributes are identical).</li>
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<li>If you redefine a join field, you can specify N in position 38 (making
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it a neither field) to prevent a program using the join logical file from
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using the redefined field.</li>
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<li>The maximum length of fields used in joining physical files is equal to
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the maximum size of keys for physical and logical files.</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 class="relref"><strong>Related reference</strong><br />
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<div><a href="rbafoappmax.htm" title="When designing files on the iSeries server, you should keep in mind the sizes for database files.">Database file sizes</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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