50 lines
3.3 KiB
HTML
50 lines
3.3 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="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Sort sequence and constraints" />
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<meta name="abstract" content="Unique constraints are implemented with indexes. If the table on which a unique constraint is added was defined with a sort sequence, the index will be created with that same sort sequence." />
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<meta name="description" content="Unique constraints are implemented with indexes. If the table on which a unique constraint is added was defined with a sort sequence, the index will be created with that same sort sequence." />
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<meta name="DC.subject" content="sort sequence, and constraints, constraint, and sort sequence" />
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<meta name="keywords" content="sort sequence, and constraints, constraint, and sort sequence" />
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<meta name="DC.Relation" scheme="URI" content="rbafyussisql.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="rbafyssconstraints" />
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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>Sort sequence and constraints</title>
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</head>
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<body id="rbafyssconstraints"><a name="rbafyssconstraints"><!-- --></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">Sort sequence and constraints</h1>
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<div><p>Unique constraints are implemented with indexes. If the table on
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which a unique constraint is added was defined with a sort sequence, the index
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will be created with that same sort sequence.</p>
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<div class="section"><p>If defining a referential constraint, the sort sequence between
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the parent and dependent table must match. </p>
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</div>
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<div class="section"><p>The sort sequence used at the time a check constraint is defined
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is the same sort sequence the system uses to validate adherence to the constraint
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at the time of an INSERT or UPDATE.</p>
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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="rbafyussisql.htm" title="A sort sequence defines how characters in a character set relate to each other when they are compared or ordered. Normalization allows you to compare strings that contain combining characters.">Sort sequences and normalization in SQL</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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