77 lines
5.5 KiB
HTML
77 lines
5.5 KiB
HTML
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<meta name="DC.Title" content="Dynamically join database files without DDS" />
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<meta name="abstract" content="The dynamic join function allows you to join files without having to first specify data description specifications (DDS) and create a join logical file." />
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<meta name="description" content="The dynamic join function allows you to join files without having to first specify data description specifications (DDS) and create a join logical file." />
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<meta name="DC.subject" content="joining, database files without DDS, database file, joining without DDS, example, JORDER (Join Order) parameter, Join Order (JORDER) parameter, parameter, JORDER (Join Order)" />
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<title>Dynamically join database files without DDS</title>
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<body id="rbafodynjf"><a name="rbafodynjf"><!-- --></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">Dynamically join database files without DDS</h1>
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<div><p>The dynamic join function allows you to join files without having
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to first specify data description specifications (DDS) and create a join logical
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file. </p>
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<p>You must use the FORMAT parameter on the Open Query File (OPNQRYF) command
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to specify the record format for the join. You can join any physical or logical
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file including a join logical file and a view (DDS does not allow you to join
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logical files). You can specify either a keyed or arrival sequence access
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path. If keys are specified, they can be from any of the files included in
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the join (DDS restricts keys to just the primary file).</p>
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<p>In the following examples, it is assumed that the file specified on the
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FORMAT parameter was created. You normally want to create the
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file before you create the processing program so you can use the externally
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described data definitions.</p>
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<p>The default for the join order (JORDER) parameter is used in all of the
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following examples. The default for the JORDER parameter is *ANY, which tells
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the system that it can determine the order in which to join the files. That
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is, the system determines which file to use as the primary file and which
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as the secondary files. This allows the system to try to improve the performance
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of the join function. </p>
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<p>The join criterion, like the record selection criterion, is affected by
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the sort sequence (SRTSEQ) and the language identifier (LANGID) specified.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbafodynjfex1.htm">Example 1: Dynamically join database files without DDS</a></strong><br />
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This example shows how to dynamically join database files without DDS.</li>
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<li class="ulchildlink"><strong><a href="rbafodynjfex2.htm">Example 2: Dynamically join database files without DDS</a></strong><br />
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This example shows how to read only those records with secondary file records when dynamically joining database files without DDS.</li>
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<li class="ulchildlink"><strong><a href="rbafodynjfex3.htm">Example 3: Dynamically join database files without DDS</a></strong><br />
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This example shows how to use mapped fields as join fields when dynamically joining database files without DDS.</li>
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</ul>
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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 class="relref"><strong>Related reference</strong><br />
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<div><a href="rbafoex11.htm" title="This example shows the use of sort sequence and language identifier when you run the Open Query File (OPNQRYF) command to select records.">Example 11: Select records using the Open Query File (OPNQRYF) command</a></div>
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</div>
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