72 lines
4.6 KiB
HTML
72 lines
4.6 KiB
HTML
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<meta name="DC.Title" content="Join logical files in DDS" />
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<meta name="abstract" content="Join logical files combine different fields from more than one physical file into a single record. You must specify the JFILE keyword at the record level for join logical files." />
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<meta name="description" content="Join logical files combine different fields from more than one physical file into a single record. You must specify the JFILE keyword at the record level for join logical files." />
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<title>Join logical files in DDS</title>
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</head>
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<body id="joins"><a name="joins"><!-- --></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 logical files in DDS</h1>
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<div><p>Join logical files combine different fields from more than one
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physical file into a single record. You must specify the JFILE keyword at
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the record level for join logical files.</p>
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<div class="section">Specify the entries in the following order to define a join logical
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file.<div class="note"><span class="notetitle">Note:</span> Because only one record format is allowed in a join logical file,
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specify these entries only once.</div>
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</div>
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<ol><li><strong>Optional: </strong><span>Specify file-level entries</span></li>
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<li><span>Specify record-level entries</span></li>
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<li><span>Specify join-level entries</span></li>
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<li><span>Specify field-level entries</span></li>
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<li><strong>Optional: </strong><span>Specify key field-level entries</span></li>
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<li><strong>Optional: </strong><span>Specify select/omit-field level entries</span></li>
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</ol>
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<div class="example">The following example shows the code for a join logical file.<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A* Joins fields from two physical files into one record format
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00020A R RECORD1 JFILE(PF1 PF2)
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00030A J JOIN(PF1 PF2)
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00040A JFLD(NAME NAME)
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00050A NAME JREF(1)
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00060A ADDR
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00070A PHONE
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A</pre>
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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="ldef.htm" title="A logical file determines how data records are selected and defined when read by an application program. A logical file can be a simple, multiple format, or join logical file.">Define a logical file using DDS</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="rzakbmstlfpos.htm" title="The first 44 positions of the DDS form are called positional entries.">Positional entries for physical and logical files (positions 1 through 44)</a></div>
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<div><a href="lfname.htm" title="Use these positions to specify record or field names.">Name for physical and logical files (positions 19 through 28)</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../dds/rbafpmstsyntax.htm">Rules for DDS keywords and parameter values</a></div>
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</div>
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</div>
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