53 lines
2.9 KiB
HTML
53 lines
2.9 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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<meta name="DC.Title" content="Example: SQL scalar UDFs" />
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<meta name="abstract" content="In this example, a function returns a priority based on a date." />
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<meta name="description" content="In this example, a function returns a priority based on a date." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: SQL scalar UDFs</title>
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</head>
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<body id="rbafyscalarudf"><a name="rbafyscalarudf"><!-- --></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: SQL scalar UDFs</h1>
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<div><p>In this example, a function returns a priority based on a date.</p>
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<div class="section"><pre><strong>CREATE FUNCTION</strong> PRIORITY(indate <strong>DATE</strong>) <strong>RETURNS CHAR</strong>(7)
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<strong>LANGUAGE SQL
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BEGIN
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RETURN(</strong>
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<strong>CASE</strong> <strong>WHEN</strong> indate><strong>CURRENT DATE</strong>-3 <strong>DAYS THEN</strong> 'HIGH'
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<strong>WHEN</strong> indate><strong>CURRENT DATE</strong>-7 <strong>DAYS THEN</strong> 'MEDIUM'
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<strong>ELSE</strong> 'LOW'
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<strong>END</strong>
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);
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<strong>END</strong></pre>
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</div>
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<div class="section"><p>The function can then be called as:</p>
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<pre><strong>SELECT</strong> ORDERNBR, PRIORITY(ORDERDUEDATE) <strong>FROM</strong> ORDERS</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="rbafyudfsql.htm" title="SQL functions are UDFs that you have defined, written, and registered using the CREATE FUNCTION SQL statement.">Write UDFs as SQL functions</a></div>
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</div>
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</body>
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</html>
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