84 lines
5.5 KiB
HTML
84 lines
5.5 KiB
HTML
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<meta name="DC.Title" content="Remove rows from a table using the DELETE statement" />
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<meta name="abstract" content="To remove rows from a table, use the DELETE statement." />
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<meta name="description" content="To remove rows from a table, use the DELETE statement." />
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<title>Remove rows from a table using the DELETE statement</title>
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</head>
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<body id="rbafydelete"><a name="rbafydelete"><!-- --></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">Remove rows from a table using the DELETE statement</h1>
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<div><p>To remove rows from a table, use the DELETE statement. </p>
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<p>When you DELETE a row, you remove the entire row. DELETE does not remove
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specific columns from the row. The result of the DELETE statement is the removal
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of zero or more rows of a table (depending on how many rows satisfy the search
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condition specified in the WHERE clause). If you omit the WHERE clause from
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a DELETE statement, SQL removes all the rows of the table. The DELETE statement
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looks like this: </p>
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<pre> <strong>DELETE FROM</strong> table-name
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<strong>WHERE</strong> search-condition ...</pre>
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<p>For example, suppose department D11 was moved to another place. You want
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to delete each row in the CORPDATA.EMPLOYEE table with a WORKDEPT value of
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D11 as follows: </p>
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<pre> <strong>DELETE FROM</strong> CORPDATA.EMPLOYEE
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<strong>WHERE</strong> WORKDEPT = 'D11'</pre>
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<p>The WHERE clause tells SQL which rows you want to delete from the table.
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SQL deletes all the rows that satisfy the search condition from the base table.
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Deleting rows from a view deletes the rows from the base table. You can omit
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the WHERE clause, but it is best to include one, because a DELETE statement
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without a WHERE clause deletes all the rows from the table or view. To delete
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a table definition as well as the table contents, issue the DROP statement. </p>
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<p>If SQL finds an error while running your DELETE statement, it stops deleting
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data and returns a negative SQLCODE. If you specify COMMIT(*ALL), COMMIT(*CS),
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COMMIT(*CHG), or COMMIT(*RR), no rows in the table are deleted (rows already
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deleted by this statement, if any, are restored to their previous values).
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If COMMIT(*NONE) is specified, any rows already deleted are <em>not</em> restored
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to their previous values.</p>
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<div class="p">If SQL cannot find any rows that satisfy the search condition, an SQLCODE
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of +100 is returned. <div class="note"><span class="notetitle">Note:</span> The DELETE statement may have deleted more than
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one row. The number of rows deleted is reflected in SQLERRD(3) of the SQLCA.
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This value is also available from the ROW_COUNT diagnostics item in the GET
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DIAGNOSTICS statement.</div>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbafyrfdeleting.htm">Delete from tables with referential constraints</a></strong><br />
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If a table has a primary key but no dependents, the DELETE statement operates as it does without referential constraints. The same is true if a table has only foreign keys, but no primary key. If a table has a primary key and dependent tables, DELETE deletes or updates rows according to the delete rules specified.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafydml.htm" title="Data manipulation language (DML) describes the portion of SQL that allows you to manipulate or control your data.">Data manipulation language</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/rbafzmstdropst.htm">DROP statement</a></div>
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<div><a href="../db2/rbafzmstdelst.htm">DELETE 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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