54 lines
3.1 KiB
HTML
54 lines
3.1 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="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: AVG over a UDT" />
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<meta name="abstract" content="This example implements the AVG column function over the CANADIAN_DOLLAR distinct type." />
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<meta name="description" content="This example implements the AVG column function over the CANADIAN_DOLLAR distinct type." />
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<meta name="DC.subject" content="examples, AVG over a UDT, CREATE FUNCTION statement, AVG over a UDT example" />
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<meta name="keywords" content="examples, AVG over a UDT, CREATE FUNCTION statement, AVG over a UDT example" />
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<meta name="DC.Relation" scheme="URI" content="rbafyudfdudf.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="rbafyudfcfx5" />
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<meta name="DC.Language" content="en-us" />
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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>Example: AVG over a UDT</title>
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</head>
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<body id="rbafyudfcfx5"><a name="rbafyudfcfx5"><!-- --></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">Example: AVG over a UDT</h1>
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<div><p>This example implements the AVG column function over the CANADIAN_DOLLAR
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distinct type.</p>
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<div class="section"><p>Strong
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typing prevents you from using the built-in AVG function on a distinct type.
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It turns out that the source type for CANADIAN_DOLLAR was DECIMAL, and so
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you implement the AVG by sourcing it on the AVG(DECIMAL) built-in function.</p>
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<pre> <strong>CREATE FUNCTION</strong> AVG (CANADIAN_DOLLAR)
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<strong>RETURNS</strong> CANADIAN_DOLLAR
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<strong>SOURCE</strong> "QSYS2".<strong>AVG</strong>(<strong>DECIMAL</strong>(9,2))</pre>
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</div>
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<div class="section"><p>Note that in the SOURCE clause you have qualified the function
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name, just in case there might be some other AVG function lurking in your
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SQL path. </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="rbafyudfdudf.htm" title="A UDF must be registered in the database before the function can be recognized and used by SQL.">Register 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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