128 lines
3.0 KiB
Plaintext
128 lines
3.0 KiB
Plaintext
<!--
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doc/src/sgml/ref/drop_trigger.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-droptrigger">
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<indexterm zone="sql-droptrigger">
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<primary>DROP TRIGGER</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>DROP TRIGGER</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>DROP TRIGGER</refname>
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<refpurpose>remove a trigger</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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DROP TRIGGER [ IF EXISTS ] <replaceable class="parameter">name</replaceable> ON <replaceable class="parameter">table_name</replaceable> [ CASCADE | RESTRICT ]
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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>DROP TRIGGER</command> removes an existing
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trigger definition. To execute this command, the current
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user must be the owner of the table for which the trigger is defined.
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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><literal>IF EXISTS</literal></term>
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<listitem>
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<para>
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Do not throw an error if the trigger does not exist. A notice is issued
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in this case.
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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">name</replaceable></term>
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<listitem>
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<para>
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The name of the trigger to remove.
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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">table_name</replaceable></term>
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<listitem>
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<para>
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The name (optionally schema-qualified) of the table for which
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the trigger is defined.
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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><literal>CASCADE</literal></term>
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<listitem>
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<para>
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Automatically drop objects that depend on the trigger,
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and in turn all objects that depend on those objects
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(see <xref linkend="ddl-depend"/>).
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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><literal>RESTRICT</literal></term>
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<listitem>
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<para>
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Refuse to drop the trigger if any objects depend on it. This is
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the default.
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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 id="sql-droptrigger-examples">
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<title>Examples</title>
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<para>
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Destroy the trigger <literal>if_dist_exists</literal> on the table
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<literal>films</literal>:
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<programlisting>
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DROP TRIGGER if_dist_exists ON films;
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</programlisting></para>
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</refsect1>
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<refsect1 id="sql-droptrigger-compatibility">
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<title>Compatibility</title>
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<para>
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The <command>DROP TRIGGER</command> statement in
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<productname>PostgreSQL</productname> is incompatible with the SQL
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standard. In the SQL standard, trigger names are not local to
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tables, so the command is simply <literal>DROP TRIGGER
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<replaceable>name</replaceable></literal>.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-createtrigger"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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