63 lines
3.5 KiB
HTML
63 lines
3.5 KiB
HTML
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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="Before you add referential constraints" />
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<meta name="abstract" content="Before you can add referential constraints, you must make sure that you meet some conditions." />
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<meta name="description" content="Before you can add referential constraints, you must make sure that you meet some conditions." />
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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>Before you add referential constraints</title>
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</head>
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<body id="rbaforzahfrch"><a name="rbaforzahfrch"><!-- --></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">Before you add referential constraints</h1>
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<div><p>Before you can add referential constraints, you must
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make sure that you meet some conditions.</p>
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<div class="p"><ul><li>There must be a parent file with a key capable of being a parent key.
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If the parent file has no primary key or unique constraint, the system tries
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to add a primary key constraint to the parent file if the field attributes
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of the potential parent key match those of the foreign key field attributes
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of the dependent file.</li>
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<li>There must be a dependent file with certain attributes that match the
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attributes of the parent file: <ul><li>Sort sequence (SRTSEQ) must match for data types CHAR, OPEN, EITHER, and
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HEX.</li>
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<li>The coded character set identifier (CCSID) must match for each SRTSEQ
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table unless either (or both) of the CCSIDs is 65535.</li>
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<li>Each sort sequence table must match exactly.</li>
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</ul>
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</li>
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<li>The dependent file must contain a foreign key that matches the following
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attributes of the parent key: <ul><li>Data type</li>
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<li>Length</li>
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<li>Precision (packed, zoned, or binary)</li>
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<li>CCSID (unless either has a CCSID of 65535)</li>
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<li>REFSHIFT (if data type is OPEN, EITHER, or ONLY)</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="rbaforzahfrce.htm" title="You can add referential constraints on physical files with no more than one member. A referential constraint is a file-level attribute; therefore, you can create the constraint before the member exists.">Add referential constraints</a></div>
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</div>
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</div>
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</body>
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</html> |