86 lines
5.0 KiB
HTML
86 lines
5.0 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 name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Summarize data from database file records (grouping)" />
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<meta name="abstract" content="The group processing function allows you to summarize data from existing database records." />
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<meta name="description" content="The group processing function allows you to summarize data from existing database records." />
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<meta name="DC.subject" content="grouping, data from database file records, database file, grouping data from records, example, grouping data from database file records, summarizing data from database file records" />
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<meta name="keywords" content="grouping, data from database file records, database file, grouping data from records, example, grouping data from database file records, summarizing data from database file records" />
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<meta name="DC.Relation" scheme="URI" content="rbafogrpex1.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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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Summarize data from database file records (grouping)</title>
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</head>
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<body id="rbafogrp"><a name="rbafogrp"><!-- --></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">Summarize data from database file records (grouping)</h1>
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<div><p>The group processing function allows you to summarize data from
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existing database records. </p>
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<div class="p">You can specify: <ul><li>The grouping fields</li>
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<li>Selection values both before and after grouping</li>
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<li>A keyed sequence access path over the new records</li>
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<li>Mapped field definitions that allow you to do such functions as sum, average,
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standard deviation, and variance, as well as counting the records in each
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group</li>
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<li>The sort sequence and language identifier that supply the weights by which
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the field values are grouped</li>
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</ul>
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</div>
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<div class="p">You normally start by creating a file with a record format containing only
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the following types of fields: <ul><li>Grouping fields. Specified on the GRPFLD parameter that define groups.
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Each group contains a constant set of values for all grouping fields. The
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grouping fields do not need to appear in the record format identified on the
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FORMAT parameter.</li>
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<li>Aggregate fields. Defined by using the MAPFLD parameter with one or more
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of the following built-in functions: <dl><dt class="dlterm">%COUNT</dt>
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<dd>Counts the records in a group</dd>
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<dt class="dlterm">%SUM</dt>
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<dd>A sum of the values of a field over the group</dd>
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<dt class="dlterm">%AVG</dt>
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<dd>Arithmetic average (mean) of a field, over the group</dd>
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<dt class="dlterm">%MAX</dt>
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<dd>Maximum value in the group for the field</dd>
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<dt class="dlterm">%MIN</dt>
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<dd>Minimum value in the group for the field</dd>
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<dt class="dlterm">%STDDEV</dt>
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<dd>Standard deviation of a field, over the group</dd>
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<dt class="dlterm">%VAR</dt>
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<dd>Variance of a field, over the group</dd>
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</dl>
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</li>
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<li>Constant fields. Allow constants to be placed in field values. The
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restriction that the Open Query File (OPNQRYF) command must know all fields
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in the output format is also true for the grouping function.</li>
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</ul>
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</div>
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<p>When you use group processing, you can only read the file sequentially.</p>
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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="rbafogrpex1.htm">Example: Summarize data from database file records (grouping)</a></strong><br />
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This example shows how to use the group processing functions to summarize data from existing database records.</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="rbafodynrs.htm" title="Dynamic record selection allows you to request a subset of the records in a file without using data description specifications (DDS).">Select records without using DDS</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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