61 lines
3.8 KiB
HTML
61 lines
3.8 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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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Update an identity column" />
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<meta name="abstract" content="You can update the value in an identity column to a specified value or have the system generate a new value." />
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<meta name="description" content="You can update the value in an identity column to a specified value or have the system generate a new value." />
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<meta name="DC.subject" content="examples, UPDATE statement, identity column, example" />
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<meta name="keywords" content="examples, UPDATE statement, identity column, example" />
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<meta name="DC.Relation" scheme="URI" content="rbafyupdate.htm" />
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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 an identity column</title>
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</head>
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<body id="rbafyupdateidentity"><a name="rbafyupdateidentity"><!-- --></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 an identity column</h1>
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<div><p>You can update the value in an identity column to a specified value
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or have the system generate a new value.</p>
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<div class="section"><p>For example, using the table with columns called ORDERNO (identity
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column), SHIPPED_TO (varchar(36)), and ORDER_DATE (date), you can update the
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value in an identity column by issuing the following statement:</p>
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<pre><strong>UPDATE</strong> ORDERS
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<strong>SET</strong> (ORDERNO, ORDER_DATE)=
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(<strong>DEFAULT</strong>, 2002-02-05)
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<strong>WHERE</strong> SHIPPED_TO = 'BME TOOL'</pre>
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<p>A value is generated
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by the system for the identity column automatically. You can override having
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the system generate a value by using the OVERRIDING SYSTEM VALUE clause:</p>
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<pre><strong>UPDATE</strong> ORDERS <strong>OVERRIDING SYSTEM VALUE</strong>
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<strong>SET</strong> (ORDERNO, ORDER_DATE)=
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(553, '2002-02-05')
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<strong>WHERE</strong> SHIPPED_TO = 'BME TOOL'</pre>
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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 class="relref"><strong>Related reference</strong><br />
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<div><a href="rbafysqlpidentity.htm" title="Every time that a new row is added to a table with an identity column, the identity column value in the new row is incremented (or decremented) by the system.">Create and alter an identity column</a></div>
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</div>
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</div>
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</body>
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</html> |