62 lines
3.8 KiB
HTML
62 lines
3.8 KiB
HTML
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<meta name="abstract" content="Suppose you want to know which products sold more than US $100 000.00 in the U.S. in the month of July, 1998 (7/98)." />
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<title>Example: Comparisons between UDTs and constants</title>
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<body id="rbafyudtcnst"><a name="rbafyudtcnst"><!-- --></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: Comparisons between UDTs and constants</h1>
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<div><p>Suppose you want to know which products sold more than US $100
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000.00 in the U.S. in the month of July, 1998 (7/98). </p>
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<div class="section"><pre> <strong>SELECT</strong> PRODUCT_ITEM
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<strong>FROM</strong> US_SALES
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<strong>WHERE</strong> TOTAL > US_DOLLAR (100000)
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<strong>AND</strong> month = 7
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<strong>AND</strong> year = 1998</pre>
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</div>
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<div class="section"><p>Because you cannot compare U.S. dollars with instances of the
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source type of U.S. dollars (that is, DECIMAL) directly, you have used the
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cast function provided by DB2<sup>®</sup> to cast from DECIMAL to U.S. dollars. You can also
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use the other cast function provided by DB2 (that is, the one to cast from U.S.
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dollars to DECIMAL) and cast the column total to DECIMAL. Either way you
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decide to cast, from or to the UDT, you can use the cast specification notation
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to perform the casting, or the functional notation. You might have written
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the above query as:</p>
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<pre> <strong>SELECT</strong> PRODUCT_ITEM
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<strong>FROM</strong> US_SALES
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<strong>WHERE</strong> TOTAL > <strong>CAST</strong> (100000 <strong>AS</strong> us_dollar)
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<strong>AND</strong> MONTH = 7
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<strong>AND</strong> YEAR = 1998</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="rbafyexampudt.htm" title="These are examples of using UDTs.">Examples: Use UDTs</a></div>
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