86 lines
5.5 KiB
HTML
86 lines
5.5 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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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Insert values into an identity column" />
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<meta name="abstract" content="You can insert a value into an identity column or allow the system to insert a value for you." />
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<meta name="description" content="You can insert a value into an identity column or allow the system to insert a value for you." />
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<meta name="DC.subject" content="INSERT statement, inserting identity column, identity column, inserting into, examples, inserting into identity columns" />
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<meta name="keywords" content="INSERT statement, inserting identity column, identity column, inserting into, examples, inserting into identity columns" />
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<meta name="DC.Relation" scheme="URI" content="rbafyinsert.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafysqlpidentity.htm" />
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<meta name="DC.Relation" scheme="URI" content="../db2/rbafzmstscale.htm" />
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<meta name="copyright" 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>Insert values into an identity column</title>
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</head>
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<body id="rbafyinsertidentity"><a name="rbafyinsertidentity"><!-- --></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">Insert values into an identity column</h1>
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<div><p>You can insert a value into an identity column or allow the system
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to insert a value for you.</p>
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<div class="section"><p>For example, a table has columns called ORDERNO (identity column),
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SHIPPED_TO (varchar(36)), and ORDER_DATE (date). You can insert a row into
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this table by issuing the following statement:</p>
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<pre><strong>INSERT INTO</strong> ORDERS (SHIPPED_TO, ORDER_DATE)
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<strong>VALUES</strong> ('BME TOOL', 2002-02-04)</pre>
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<p>In this case, a value
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is generated by the system for the identity column automatically. You can
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also write this statement using the DEFAULT keyword:</p>
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<pre><strong>INSERT INTO</strong> ORDERS (SHIPPED_TO, ORDER_DATE, ORDERNO)
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<strong>VALUES</strong> ('BME TOOL', 2002-02-04, <strong>DEFAULT</strong>)</pre>
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<p>After
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the insert, you can use the IDENTITY_VAL_LOCAL function to determine the value
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that the system assigned to the column. </p>
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</div>
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<div class="section"><p>Sometimes a value for an identity column is specified by the user,
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such as in this INSERT statement using a SELECT: </p>
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<pre><strong>INSERT INTO</strong> ORDERS <strong>OVERRIDING USER VALUE</strong>
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(<strong>SELECT * FROM</strong> TODAYS_ORDER)</pre>
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<p>In this case, OVERRIDING
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USER VALUE tells the system to ignore the value provided for the identity
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column from the SELECT and to generate a new value for the identity column.
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OVERRIDING USER VALUE must be used if the identity column was created with
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the GENERATED ALWAYS clause; it is optional for GENERATED BY DEFAULT. If OVERRIDING
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USER VALUE is not specified for a GENERATED BY DEFAULT identity column, the
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value provided for the column in the SELECT is inserted.</p>
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</div>
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<div class="section"><p>You can force the system to use the value from the select for
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a GENERATED ALWAYS identity column by specifying OVERRIDING SYSTEM VALUE.
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For example, issue the following statement: </p>
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<pre><strong>INSERT INTO</strong> ORDERS <strong>OVERRIDING SYSTEM VALUE</strong>
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(<strong>SELECT * FROM</strong> TODAYS_ORDER)</pre>
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<p>This INSERT statement
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uses the value from SELECT; it does not generate a new value for the identity
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column. You cannot provide a value for an identity column created using GENERATED
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ALWAYS without using the OVERRIDING SYSTEM VALUE clause.</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="rbafyinsert.htm" title="This topic shows the basic SQL statements and clauses that insert data into tables and views. Examples using these SQL statements are supplied to help you develop SQL applications.">Insert rows using the INSERT 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 class="relinfo"><strong>Related information</strong><br />
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<div><a href="../db2/rbafzmstscale.htm">IDENTITY_VAL_LOCAL</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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