167 lines
9.1 KiB
HTML
167 lines
9.1 KiB
HTML
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<meta name="DC.Title" content="Arrange key fields using an alternative collating sequence" />
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<meta name="abstract" content="Keyed fields defined as character fields can be arranged based either on the sequence for EBCDIC characters or on an alternative collating sequence." />
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<title>Arrange key fields using an alternative collating sequence</title>
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<body id="rbafoacolsq"><a name="rbafoacolsq"><!-- --></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">Arrange key fields using an alternative collating sequence</h1>
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<div><p>Keyed fields defined as character fields can be arranged based
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either on the sequence for EBCDIC characters or on an alternative collating
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sequence.</p>
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<p>Consider the following records.</p>
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<table cellpadding="4" cellspacing="0" border="1" class="tableborder"><tr><td>
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<table cellpadding="4" cellspacing="0" summary="" width="100%" border="0"><thead align="left"><tr><th align="left" valign="top" id="d0e48">Record</th>
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<th align="left" valign="top" id="d0e50">Empname</th>
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<th align="left" valign="top" id="d0e52">Deptnbr</th>
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<th align="left" valign="top" id="d0e54">Empnbr</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" headers="d0e48 ">1</td>
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<td align="left" valign="top" headers="d0e50 ">Jones, Mary</td>
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<td align="left" valign="top" headers="d0e52 ">45</td>
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<td align="left" valign="top" headers="d0e54 ">23318</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e48 ">2</td>
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<td align="left" valign="top" headers="d0e50 ">Smith, Ron</td>
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<td align="left" valign="top" headers="d0e52 ">45</td>
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<td align="left" valign="top" headers="d0e54 ">41321</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e48 ">3</td>
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<td align="left" valign="top" headers="d0e50 ">JOHNSON, JOHN</td>
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<td align="left" valign="top" headers="d0e52 ">53</td>
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<td align="left" valign="top" headers="d0e54 ">41322</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e48 ">4</td>
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<td align="left" valign="top" headers="d0e50 ">Smith, ROBERT</td>
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<td align="left" valign="top" headers="d0e52 ">27</td>
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<td align="left" valign="top" headers="d0e54 ">56218</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e48 ">5</td>
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<td align="left" valign="top" headers="d0e50 ">JONES, MARTIN</td>
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<td align="left" valign="top" headers="d0e52 ">53</td>
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<td align="left" valign="top" headers="d0e54 ">62213</td>
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</tr>
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</tbody>
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</table>
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</td></tr></table>
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<p>If the <em>Empname</em> is the key field and is a character field, using
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the sequence for EBCDIC characters, the records can be arranged as follows.</p>
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<table cellpadding="4" cellspacing="0" border="1" class="tableborder"><tr><td>
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<table cellpadding="4" cellspacing="0" summary="" width="100%" border="0"><thead align="left"><tr><th align="left" valign="top" id="d0e115">Record</th>
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<th align="left" valign="top" id="d0e117">Empname</th>
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<th align="left" valign="top" id="d0e119">Deptnbr</th>
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<th align="left" valign="top" id="d0e121">Empnbr</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" headers="d0e115 ">1</td>
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<td align="left" valign="top" headers="d0e117 ">Jones, Mary</td>
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<td align="left" valign="top" headers="d0e119 ">45</td>
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<td align="left" valign="top" headers="d0e121 ">23318</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e115 ">3</td>
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<td align="left" valign="top" headers="d0e117 ">JOHNSON, JOHN</td>
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<td align="left" valign="top" headers="d0e119 ">53</td>
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<td align="left" valign="top" headers="d0e121 ">41322</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e115 ">5</td>
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<td align="left" valign="top" headers="d0e117 ">JONES, MARTIN</td>
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<td align="left" valign="top" headers="d0e119 ">53</td>
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<td align="left" valign="top" headers="d0e121 ">62213</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e115 ">2</td>
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<td align="left" valign="top" headers="d0e117 ">Smith, Ron</td>
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<td align="left" valign="top" headers="d0e119 ">45</td>
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<td align="left" valign="top" headers="d0e121 ">41321</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e115 ">4</td>
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<td align="left" valign="top" headers="d0e117 ">Smith, ROBERT</td>
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<td align="left" valign="top" headers="d0e119 ">27</td>
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<td align="left" valign="top" headers="d0e121 ">56218</td>
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</tr>
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</tbody>
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</table>
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</td></tr></table>
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<p>Notice that the EBCDIC sequence causes an unexpected sort order because
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the lowercase characters are sorted before uppercase characters. Thus, <samp class="codeph">Smith,
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Ron</samp> sorts before <samp class="codeph">Smith, ROBERT</samp>. An alternative collating
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sequence can be used to sort the records when the records were entered using
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uppercase and lowercase as shown in the following example.</p>
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<table cellpadding="4" cellspacing="0" border="1" class="tableborder"><tr><td>
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<table cellpadding="4" cellspacing="0" summary="" width="100%" border="0"><thead align="left"><tr><th align="left" valign="top" id="d0e185">Record</th>
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<th align="left" valign="top" id="d0e187">Empname</th>
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<th align="left" valign="top" id="d0e189">Deptnbr</th>
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<th align="left" valign="top" id="d0e191">Empnbr</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" headers="d0e185 ">3</td>
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<td align="left" valign="top" headers="d0e187 ">JOHNSON, JOHN</td>
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<td align="left" valign="top" headers="d0e189 ">53</td>
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<td align="left" valign="top" headers="d0e191 ">41322</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e185 ">5</td>
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<td align="left" valign="top" headers="d0e187 ">JONES, MARTIN</td>
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<td align="left" valign="top" headers="d0e189 ">53</td>
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<td align="left" valign="top" headers="d0e191 ">62213</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e185 ">1</td>
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<td align="left" valign="top" headers="d0e187 ">Jones, Mary</td>
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<td align="left" valign="top" headers="d0e189 ">45</td>
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<td align="left" valign="top" headers="d0e191 ">23318</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e185 ">4</td>
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<td align="left" valign="top" headers="d0e187 ">Smith, ROBERT</td>
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<td align="left" valign="top" headers="d0e189 ">27</td>
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<td align="left" valign="top" headers="d0e191 ">56218</td>
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</tr>
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<tr><td align="left" valign="top" headers="d0e185 ">2</td>
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<td align="left" valign="top" headers="d0e187 ">Smith, Ron</td>
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<td align="left" valign="top" headers="d0e189 ">45</td>
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<td align="left" valign="top" headers="d0e191 ">41321</td>
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</tr>
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</tbody>
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</table>
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</td></tr></table>
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<p>To use an alternative collating sequence for a character key field, specify
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the ALTSEQ DDS keyword, and specify the name of the table containing the alternative
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collating sequence. When setting up a table, each 2-byte position in the table
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corresponds to a character. To change the order in which a character is sorted,
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change its 2-digit value to the same value as the character it should be sorted
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equal to. For information about sorting uppercase and lowercase characters
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regardless of their case, the QCASE256 table in library QUSRSYS is provided
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for you.</p>
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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="rbafoksapa.htm" title="A keyed sequence access path for database files is based on the contents of the key fields as defined in data description specifications (DDS). This topic describes how the key fields are arranged for the file.">Use a keyed sequence access path for database files</a></div>
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</div>
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</div>
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</body>
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</html> |