78 lines
5.1 KiB
HTML
78 lines
5.1 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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<head>
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Durations" />
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<meta name="abstract" content="A duration is a number representing an interval of time. This topic introduces various types of durations." />
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<meta name="description" content="A duration is a number representing an interval of time. This topic introduces various types of durations." />
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<meta name="DC.subject" content="duration (Date, time, and timestamp)" />
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<meta name="keywords" content="duration (Date, time, and timestamp)" />
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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="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Durations</title>
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</head>
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<body id="rbafodttadur"><a name="rbafodttadur"><!-- --></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">Durations</h1>
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<div><p>A <em>duration</em> is a number representing an interval of time.
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This topic introduces various types of durations.</p>
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<div class="section"><h4 class="sectiontitle">Date duration</h4><p>A
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date duration represents a number of years, months, and days, expressed as
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a DECIMAL(8,0) number. To be properly interpreted, the number must have the
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format <em>yyyymmdd</em>, where <em>yyyy</em> represents the number of years, <em>mm</em> the
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number of months, and <em>dd</em> the number of days. The result of subtracting
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one date value from another, as in the expression HIREDATE - BRTHDATE, is
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a date duration.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Labeled duration</h4><p>A
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labeled duration represents a specific unit of time as expressed by a number
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(which can be the result of an expression) used as an operand for one of the
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seven duration built-in functions: %DURYEAR, %DURMONTH, %DURDAY, %DURHOUR,
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%DURMINUTE, %DURSEC, or %DURMICSEC. The functions are for the duration of
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year, month, day, hour, minute, second, and microsecond, respectively. The
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number specified is converted as if it were assigned to a DECIMAL(15,0)
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number. A labeled duration can only be used as an operand of an arithmetic
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operator when the other operand is a value of data type *DATE, *TIME, or *TIMESTP.
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Thus, the expression HIREDATE + %DURMONTH(2) + %DURDAY(14) is valid, whereas
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the expression HIREDATE + (%DURMONTH(2) + %DURDAY(14)) is not. In both of
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these expressions, the labeled durations are %DURMONTH(2) and %DURDAY(14).</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Time duration</h4><p>A
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time duration represents a number of hours, minutes, and seconds, expressed
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as a DECIMAL(6,0) number. To be properly interpreted, the number must have
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the format <em>hhmmss</em>, where <em>hh</em> represents the number of hours, <em>mm</em> the
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number of minutes, and <em>ss</em> the number of seconds. The result of subtracting
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one time value from another is a time duration.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Timestamp duration</h4><p>A
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timestamp duration represents a number of years, months, days, hours, minutes,
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seconds, and microseconds, expressed as a DECIMAL(20,6) number. To be properly
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interpreted, the number must have the format <em>yyyymmddhhmmsszzzzzz,</em> where <em>yyyy,
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mm, dd, hh, mm, ss, <span>and</span> zzzzzz</em> represent, respectively, the number
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of years, months, days, hours, minutes, seconds, and microseconds. The result
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of subtracting one timestamp value from another is a timestamp duration.</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="rbafodttaopq.htm" title="Date, time, and timestamp values can be incremented, decremented, and subtracted. These operations might involve decimal numbers called durations. These topics include a definition of durations and a specification of the rules for performing arithmetic operations on date, time, and timestamp values.">Perform date, time, and timestamp arithmetic using the Open Query File (OPNQRYF) command</a></div>
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</div>
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</div>
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</body>
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</html> |