70 lines
4.1 KiB
HTML
70 lines
4.1 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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2005" />
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<meta name="DC.rights.owner" content="(C) Copyright IBM Corporation 2005" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="task" />
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<meta name="DC.Title" content="Delete information from a table" />
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<meta name="DC.Relation" scheme="URI" content="rzatcgetstartsql.htm" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="deletesql" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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>Delete information from a table</title>
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</head>
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<body id="deletesql"><a name="deletesql"><!-- --></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">Delete information from a table</h1>
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<div><div class="section">You can delete data from a table by using the SQL DELETE statement.
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You can delete entire rows from a table when they no longer contain needed
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information or you can use the WHERE clause with the DELETE statement to identify
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rows to be deleted during a single statement execution.<p>To remove all the
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rows in a table that have the null value for the QUANTITY_ON_HAND column,
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follow these steps:</p>
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</div>
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<ol><li class="stepexpand"><span>Enter the following statement on the Enter SQL Statements display:</span> <pre><strong>DELETE</strong>
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<strong>FROM</strong> SAMPLECOLL.INVENTORY_LIST
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<strong>WHERE</strong> QUANTITY_ON_HAND IS NULL</pre>
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To check a column for the
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null value, the IS NULL comparison is used.<p>This <a href="codedisclaimer.htm">disclaimer information</a> pertains to code examples.</p>
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</li>
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<li class="stepexpand"><span>After the delete operation is completed, run another
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SELECT statement. This results in the following table:</span> <div class="p"><pre class="screen"> Display Data
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Data width . . . . . . : 71
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Position to line . . . . . Shift to column . . . . . .
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....+....1....+....2....+....3....+....4....+....5....+....6....+....7.
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ITEM ITEM UNIT QUANTITY LAST NUMBER
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NUMBER NAME COST ON ORDER ORDERED
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HAND DATE
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153047 Pencils, red 10.00 25 - 20
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229740 Lined tablets 1.50 120 - 20
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303476 Paper clips 2.00 100 05/30/94 50
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559343 Envelopes, legal 3.00 500 - 20
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775298 Chairs, secretary 225.00 6 - 20
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073956 Pens, black 20.00 25 - 20
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******** End of data ********
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Bottom
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F3=Exit F12=Cancel F19=Left F20=Right F21=Split</pre>
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</div>
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</li>
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</ol>
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<div class="section">The rows with a null value for QUANTITY_ON_HAND were deleted.</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="rzatcgetstartsql.htm" title="This topic describes how to create and work with schemas, tables, and views using SQL statements in interactive SQL.">Get started with SQL</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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