75 lines
4.9 KiB
HTML
75 lines
4.9 KiB
HTML
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<meta name="DC.Title" content="Create and use ALIAS names" />
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<meta name="abstract" content="When you refer to an existing table or view, or to a physical file that consists of multiple members, you can avoid using file overrides by creating an alias. You can use the SQL CREATE ALIAS statement to do this." />
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<title>Create and use ALIAS names</title>
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<body id="rbafycreatingalias"><a name="rbafycreatingalias"><!-- --></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 ALIAS names</h1>
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<div><p>When you refer to an existing table or view, or to a physical file
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that consists of multiple members, you can avoid using file overrides by creating
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an alias. You can use the SQL CREATE ALIAS statement to do this.</p>
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<div class="section"><p>You can create an alias for:</p>
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<ul><li>A table or view</li>
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<li>A <em>member</em> of a table</li>
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</ul>
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</div>
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<div class="section"><p>A table alias defines a name for the file, including the specific
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member name. You can use this alias name in an SQL statement in the same way
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that a table name is used. Unlike overrides, alias names are objects that
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exist until they are dropped. </p>
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</div>
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<div class="section"><p>For example, if there is a multiple member file MYLIB.MYFILE with
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members MBR1 and MBR2, an alias can be created for the second member so that
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SQL can easily refer to it. </p>
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<pre><strong>CREATE ALIAS</strong> MYLIB.MYMBR2_ALIAS <strong>FOR</strong> MYLIB.MYFILE (MBR2)</pre>
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</div>
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<div class="section"><p>When alias MYLIB.MYMBR2_ALIAS is specified on the following insert
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statement, the values are inserted into member MBR2 in MYLIB.MYFILE. </p>
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<pre><strong>INSERT INTO</strong> MYLIB.MYMBR2_ALIAS <strong>VALUES</strong>('ABC', 6)</pre>
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</div>
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<div class="section"><p>Alias names can also be specified on DDL statements. Assume that
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alias MYLIB.MYALIAS exists and is an alias for table MYLIB.MYTABLE. The following
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DROP statement will drop table MYLIB.MYTABLE. </p>
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<pre><strong>DROP TABLE</strong> MYLIB.MYALIAS</pre>
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</div>
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<div class="section"><p>If you really want to drop the alias name instead, specify the
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ALIAS keyword on the drop statement: </p>
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<pre><strong>DROP ALIAS</strong> MYLIB.MYALIAS</pre>
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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="rbafysqltech.htm" title="Data definition language (DDL) describes the portion of SQL that allows you to create, alter, and destroy database objects. These database objects include schemas, tables, views, sequences, catalogs, indexes, and aliases.">Data definition language (DDL)</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../db2/rbafzmsthcalias.htm">CREATE ALIAS</a></div>
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</div>
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</div>
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