53 lines
3.6 KiB
HTML
53 lines
3.6 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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="User-defined functions" />
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<meta name="abstract" content="A user-defined function is a program that can be called like any built-in function." />
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<meta name="description" content="A user-defined function is a program that can be called like any built-in function." />
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<meta name="DC.subject" content="UDFs (User-defined functions), definition" />
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<meta name="keywords" content="UDFs (User-defined functions), definition" />
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<meta name="DC.Relation" scheme="URI" content="rbafysqlobjects.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafyudf.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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<title>User-defined functions</title>
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</head>
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<body id="rbafyusrdeffun"><a name="rbafyusrdeffun"><!-- --></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">User-defined functions</h1>
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<div><p><span>A <dfn class="term">user-defined function</dfn> is
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a program that can be called like any built-in function. </span></p>
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<p><span class="keyword">DB2<sup>®</sup> UDB for iSeries™</span> supports external
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functions, SQL functions, and sourced functions. External functions can be
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any system ILE program or service program. An SQL function is defined entirely
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in SQL and can contain SQL statements, including SQL control statements. A
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sourced function is built over any built-in or any existing user-defined function.
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You can create a scalar function or a table function as either an SQL or external
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function. </p>
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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="rbafysqlobjects.htm" title="SQL objects are schemas, journals, catalogs, tables, aliases, views, indexes, constraints, triggers, sequences, stored procedures, user-defined functions, user-defined types, and SQL packages. SQL creates and maintains these objects as system objects.">SQL objects</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rbafyudf.htm" title="In writing SQL applications, you can implement some actions or operations as a UDF or as a subroutine in your application: Although it may appear easier to implement new operations as subroutines in your application, you might want to consider the advantages of using a UDF instead.">Use user-defined functions (UDFs)</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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