71 lines
4.2 KiB
HTML
71 lines
4.2 KiB
HTML
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<title>DDS syntax for a join logical file</title>
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</head>
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<body id="jlfexam"><a name="jlfexam"><!-- --></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">DDS syntax for a join logical file</h1>
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<div><div class="fignone"><br /><img src="rv2f116.gif" alt="Syntax for a Join Logical
File. An illustration of a DDS coding form that describes a join logical file." /><br /></div>
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<dl><dt class="dlterm"><span>1</span></dt>
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<dd>Comments
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(optional): Comments can appear on any line in DDS. They are identified by
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an asterisk in position 7.</dd>
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<dt class="dlterm"><span>2</span></dt>
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<dd>File level (optional): File-level keywords appear before the record format
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name (RECORD1 on line 00040).</dd>
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<dt class="dlterm"><span>3</span></dt>
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<dd>Record level (exactly one required): R in position 17 identifies RECORD1
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as a record format name. In join logical files, the JFILE keyword is required
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for the record format. The record level continues until the first join specification.</dd>
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<dt class="dlterm"><span>4</span></dt>
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<dd>Join level: J in position 17 identifies the beginning of a join specification.
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At the join level, specify at least one join specification. Each join specification
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must include at least one JFLD keyword. There must be one JOIN keyword for
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each join specification in a join logical file if there is more than one join
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specification in the file. A join specification continues until the next
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join specification or field name.</dd>
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<dt class="dlterm"><span>5</span></dt>
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<dd>Field level: At least one field name with usage other than N is required
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for join logical files.</dd>
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<dt class="dlterm"><span>6</span></dt>
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<dd>Key field level (optional): K in position 17 identifies the field as a
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key field. A K must be specified for each key field. Specify the key field
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level by repeating one or more field names (such as FIELDA) after the field-level
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specifications.</dd>
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<dt class="dlterm"><span>7</span></dt>
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<dd>Select and omit levels (optional): S in position 17 identifies FIELDB
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as a select field. (O in position 17 identifies a field as an omit field.)
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The select and omit levels follow the key field level.</dd>
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</dl>
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<div class="note"><span class="notetitle">Note:</span> See the <a href="../rzakb/rzakbmstlfpos.htm">Positional
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entries for physical and logical files</a> topic for a description of each
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of the columns shown in the figure.</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="syntaxexam.htm" title="These topics provide syntax coding examples. Except for HLPARA, JFILE, JFLD, and PFILE, the keywords shown in these examples are not actual keywords. They indicate where you should specify the keywords.">Examples: DDS syntax coding</a></div>
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</div>
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</body>
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