58 lines
3.3 KiB
HTML
58 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 name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Order of operations for ALTER TABLE statement" />
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<meta name="abstract" content="An ALTER TABLE statement is performed as this set of steps shows." />
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<meta name="description" content="An ALTER TABLE statement is performed as this set of steps shows." />
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<meta name="DC.subject" content="ALTER TABLE statement, order of operation" />
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<meta name="keywords" content="ALTER TABLE statement, order of operation" />
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<meta name="DC.Relation" scheme="URI" content="rbafyalter.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="rbafyorderop" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Order of operations for ALTER TABLE statement</title>
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</head>
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<body id="rbafyorderop"><a name="rbafyorderop"><!-- --></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">Order of operations for ALTER TABLE statement</h1>
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<div><p>An ALTER TABLE statement is performed as this set of steps shows.</p>
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<div class="section"> <ol><li>Drop constraints</li>
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<li>Drop materialized query table</li>
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<li>Drop partition information</li>
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<li>Drop columns for which the RESTRICT option was specified</li>
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<li>Alter column definitions (this includes adding columns and dropping columns
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for which the CASCADE option was specified)</li>
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<li>Add or alter materialized query table</li>
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<li>Add partitioning to a table</li>
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<li>Add constraints</li>
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</ol>
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</div>
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<div class="section"><p>Within each of these steps, the order in which you specify the
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clauses is the order in which they are performed, with one exception. If
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any columns are being dropped, that operation is logically done before any
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column definitions are added or altered, in case record length is increased
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as a result of the ALTER TABLE statement.</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="rbafyalter.htm" title="Changing the definition of a table allows you to add new columns, change an existing column definition (change its length, default value, and so on), drop existing columns, and add and remove constraints.">Change a table definition</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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