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143 lines
3.6 KiB
Text
143 lines
3.6 KiB
Text
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/delete.sgml,v 1.17 2003/04/26 23:56:51 petere Exp $
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PostgreSQL documentation
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-->
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<refentry id="SQL-DELETE">
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<refmeta>
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<refentrytitle id="SQL-DELETE-TITLE">DELETE</refentrytitle>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>DELETE</refname>
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<refpurpose>delete rows of a table</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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DELETE FROM [ ONLY ] <replaceable class="PARAMETER">table</replaceable> [ WHERE <replaceable class="PARAMETER">condition</replaceable> ]
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>DELETE</command> deletes rows that satisfy the
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<literal>WHERE</literal> clause from the specified table. If the
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<literal>WHERE</literal> clause is absent, the effect is to delete
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all rows in the table. The result is a valid, but empty table.
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</para>
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<tip>
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<para>
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<xref linkend="sql-truncate" endterm="sql-truncate-title"> is a
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<productname>PostgreSQL</productname> extension which provides a
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faster mechanism to remove all rows from a table.
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</para>
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</tip>
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<para>
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By default, <command>DELETE</command> will delete rows in the
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specified table and all its subtables. If you wish to only delete
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from the specific table mentioned, you must use the
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<literal>ONLY</literal> clause.
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</para>
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<para>
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You must have the <literal>DELETE</literal> privilege on the table
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to delete from it, as well as the <literal>SELECT</literal>
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privilege to any table whose values are read in the <replaceable
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class="parameter">condition</replaceable>.
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><replaceable class="parameter">table</replaceable></term>
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<listitem>
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<para>
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The name (optionally schema-qualified) of an existing table.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">condition</replaceable></term>
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<listitem>
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<para>
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A value expression that returns a value of type
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<type>boolean</type> that determines the rows which are to be
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deleted.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Diagnostics</title>
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<variablelist>
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<varlistentry>
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<term><computeroutput>DELETE <replaceable class="parameter">count</replaceable></computeroutput></term>
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<listitem>
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<para>
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Message returned if rows are successfully deleted. The
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<replaceable class="parameter">count</replaceable> is the number
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of rows deleted. If <replaceable
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class="parameter">count</replaceable> is 0, no rows were
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deleted.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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Delete all films but musicals:
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<programlisting>
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DELETE FROM films WHERE kind <> 'Musical';
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</programlisting>
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</para>
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<para>
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Clear the table <literal>films</literal>:
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<programlisting>
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DELETE FROM films;
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</programlisting>
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</para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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This command conforms to the SQL standard.
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:nil
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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sgml-parent-document:nil
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sgml-default-dtd-file:"../reference.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:"/usr/lib/sgml/catalog"
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sgml-local-ecat-files:nil
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End:
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-->
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