70 lines
3.9 KiB
HTML
70 lines
3.9 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="copyright" content="(C) Copyright IBM Corporation 2005" />
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<meta name="DC.rights.owner" content="(C) Copyright IBM Corporation 2005" />
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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="task" />
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<meta name="DC.Title" content="Create and use a view" />
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<meta name="DC.Relation" scheme="URI" content="rzatcgetstartinav.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzatcsingletable.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzatcwhere.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzatcmulttables.htm" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzatcview" />
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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>Create and use a view</title>
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</head>
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<body id="rzatcview"><a name="rzatcview"><!-- --></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">Create and use a view</h1>
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<div><div class="section">You might find that no single table contains all the information
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you need. You might also want to give users access to only part of the data
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in a table. Views provide a way to divide the table so that you deal with
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only the data you need. A view reduces complexity and, at the same time, restricts
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access. <p>In order to create a view, you must have the correct authority
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to the tables or physical files on which the view is based. See the <a href="../db2/rbafzmsthcview.htm">CREATE VIEW</a> statement
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in the SQL Reference topic for a list of authorities needed.</p>
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<p>If you
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did not specify column names in the view definition, the column names are
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the same as those for the table on which the view is based.</p>
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<p>You can
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make changes to a table through a view even if the view has a different number
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of columns or rows than the table. For INSERT, columns in the table that are
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not in the view must have a default value. </p>
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<p>You can use the view as
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though it were a table, even though the view is totally dependent on one or
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more tables for data. The view has no data of its own and therefore requires
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no storage for the data. Because a view is derived from a table that exists
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in storage, when you update the view data, you are really updating data in
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the table. Therefore, views are automatically kept up-to-date as the tables
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they depend on are updated. </p>
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</div>
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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="rzatcsingletable.htm">Create a view over a single table</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzatcwhere.htm">Create a WHERE clause</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzatcmulttables.htm">Create a view combining data from multiple tables</a></strong><br />
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</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="rzatcgetstartinav.htm" title="This tutorial describes how to create and work with schemas, tables, and views using iSeries Navigator.">Get started with iSeries Navigator</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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