57 lines
3.7 KiB
HTML
57 lines
3.7 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="security" content="public" />
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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="reference" />
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<meta name="DC.Title" content="Update a table using a scalar-subselect" />
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<meta name="abstract" content="Another way to select a value (or multiple values) for an update is to use a scalar-subselect. The scalar-subselect allows you to update one or more columns by setting them to one or more values selected from another table." />
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<meta name="description" content="Another way to select a value (or multiple values) for an update is to use a scalar-subselect. The scalar-subselect allows you to update one or more columns by setting them to one or more values selected from another table." />
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<meta name="DC.subject" content="examples, UPDATE statement, scalar subselect, example" />
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<meta name="keywords" content="examples, UPDATE statement, scalar subselect, example" />
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<meta name="DC.Relation" scheme="URI" content="rbafyupdate.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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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rbafyupdatesub" />
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<meta name="DC.Language" content="en-us" />
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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>Update a table using a scalar-subselect</title>
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</head>
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<body id="rbafyupdatesub"><a name="rbafyupdatesub"><!-- --></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">Update a table using a scalar-subselect</h1>
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<div><p>Another way to select a value (or multiple values) for an update
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is to use a scalar-subselect. The scalar-subselect allows you to update one
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or more columns by setting them to one or more values selected from another
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table.</p>
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<div class="section"><p>In the following example, an employee moves to a different department
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but continues working on the same projects. The employee table has already
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been updated to contain the new department number. Now the project table needs
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to be updated to reflect the new department number of this employee (employee
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number is '000030'). </p>
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<pre><strong>UPDATE</strong> PROJECT
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<strong>SET</strong> DEPTNO =
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(<strong>SELECT</strong> WORKDEPT <strong>FROM</strong> EMPLOYEE
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<strong>WHERE</strong> PROJECT.RESPEMP = EMPLOYEE.EMPNO)
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<strong>WHERE</strong> RESPEMP='000030'</pre>
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<p>This same technique can be used
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to update a list of columns with multiple values returned from a single select.</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="rbafyupdate.htm" title="This topic shows the basic SQL statement and clauses that update data into tables and views. To change the data in a table, use the UPDATE statement.">Change data in a table using the UPDATE statement</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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