75 lines
4.9 KiB
HTML
75 lines
4.9 KiB
HTML
<?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="reference" />
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<meta name="DC.Title" content="Date, time, and timestamp data types" />
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<meta name="abstract" content="Date, time, and timestamp are data types represented in an internal form not seen by the SQL user." />
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<meta name="description" content="Date, time, and timestamp are data types represented in an internal form not seen by the SQL user." />
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<meta name="DC.subject" content="SELECT statement, date value, time value, timestamp value, statements, date value, time value, date format, time format, timestamp format" />
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<meta name="keywords" content="SELECT statement, date value, time value, timestamp value, statements, date value, time value, date format, time format, timestamp format" />
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<meta name="DC.Relation" scheme="URI" content="rbafyspecifycurdate.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafydatearithmetic.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Date, time, and timestamp data types</title>
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</head>
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<body id="rbafydtts"><a name="rbafydtts"><!-- --></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">Date, time, and timestamp data types</h1>
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<div><p>Date, time, and timestamp are data types represented in an internal
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form not seen by the SQL user. </p>
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<div class="section"><p>Date, time, and timestamp can be represented by character string
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values and assigned to character string variables. The database manager recognizes
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the following as date, time, and timestamp values: </p>
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<ul><li>A value returned by the DATE, TIME, or TIMESTAMP scalar functions.</li>
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<li>A value returned by the CURRENT DATE, CURRENT TIME, or CURRENT TIMESTAMP
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special registers.</li>
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<li><img src="./delta.gif" alt="Start of change" />A value of a character string in the ANSI/ISO standard
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date, time, or timestamp format, for example, <strong>DATE</strong> '1950-01-01'.<img src="./deltaend.gif" alt="End of change" /></li>
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<li>A character string when it is an operand of an arithmetic expression or
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a comparison <em>and</em> the other operand is a date, time, or timestamp.
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For example, in the predicate: <pre>… <strong>WHERE</strong> HIREDATE < '1950-01-01'</pre>
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<p>if
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HIREDATE is a date column, the character string '1950-01-01' is interpreted
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as a date.</p>
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</li>
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<li>A character string variable or constant used to set a date, time, or timestamp
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column in either the SET clause of an UPDATE statement, or the VALUES clause
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of an INSERT statement.</li>
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</ul>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbafyspecifycurdate.htm">Specify current date and time values</a></strong><br />
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You can specify a current date, time, or timestamp in an expression by specifying one of three special registers: CURRENT DATE, CURRENT TIME, or CURRENT TIMESTAMP.</li>
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<li class="ulchildlink"><strong><a href="rbafydatearithmetic.htm">Date/time arithmetic</a></strong><br />
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Addition and subtraction are the only arithmetic operators applicable to date, time, and timestamp values.</li>
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</ul>
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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/rbafzmstch2data.htm">Data types</a></div>
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</div>
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</div>
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</body>
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</html> |