64 lines
4.2 KiB
HTML
64 lines
4.2 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="Cast data types" />
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<meta name="abstract" content="Sometimes you will find situations where the type of an expression needs to be cast, or changed, to a different data type or to the same data type with a different length, precision, or scale." />
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<meta name="description" content="Sometimes you will find situations where the type of an expression needs to be cast, or changed, to a different data type or to the same data type with a different length, precision, or scale." />
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<meta name="DC.subject" content="SELECT statement, casting data types, data types, casting" />
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<meta name="keywords" content="SELECT statement, casting data types, data types, casting" />
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<meta name="DC.Relation" scheme="URI" content="rbafytexas.htm" />
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<meta name="DC.Relation" scheme="URI" content="../db2/rbafzmstcastdt.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="rbafycasting" />
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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>Cast data types</title>
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</head>
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<body id="rbafycasting"><a name="rbafycasting"><!-- --></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">Cast data types</h1>
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<div><p>Sometimes you will find situations where the <em>type</em> of an
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expression needs to be cast, or changed, to a different data type or to the
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same data type with a different length, precision, or scale.</p>
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<div class="section"><p>For example, if you want to compare two columns of different types,
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such as a user defined type based on character and an integer, you can change
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the character to an integer or the integer to a character to make the comparison
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possible. A data type that can be changed to another data type is <em>castable</em> from
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the source data type to the target data type.</p>
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</div>
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<div class="section"><p>You can use cast functions or CAST specification to explicitly
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cast a data type to another data type. For example, if you have a column of
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dates (BIRTHDATE) defined as DATE and want to cast the column data type to
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CHARACTER with a fixed length of 10, enter the following:</p>
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<pre><strong>SELECT CHAR</strong> (BIRTHDATE,USA)
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<strong>FROM</strong> CORPDATA.EMPLOYEE</pre>
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<p>You can also use the CAST specification
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to cast data types directly.</p>
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<pre><strong>SELECT CAST</strong>(BIRTHDATE <strong>AS CHAR</strong>(10))
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<strong>FROM</strong> CORPDATA.EMPLOYEE</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="rbafytexas.htm" title="Learn a variety of ways of tailoring your query to gather data using the SELECT statement. One way to do this is to use the SELECT statement in a program to retrieve a specific row (for example, the row for an employee). Furthermore, you can use clauses to gather data in a specific way.">Retrieve data using the SELECT statement</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/rbafzmstcastdt.htm">Cast between data types</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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