129 lines
3.0 KiB
Plaintext
129 lines
3.0 KiB
Plaintext
<!--
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doc/src/sgml/ref/drop_transform.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-droptransform">
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<indexterm zone="sql-droptransform">
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<primary>DROP TRANSFORM</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>DROP TRANSFORM</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 TRANSFORM</refname>
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<refpurpose>remove a transform</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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DROP TRANSFORM [ IF EXISTS ] FOR <replaceable>type_name</replaceable> LANGUAGE <replaceable>lang_name</replaceable> [ CASCADE | RESTRICT ]
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</synopsis>
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</refsynopsisdiv>
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<refsect1 id="sql-droptransform-description">
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<title>Description</title>
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<para>
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<command>DROP TRANSFORM</command> removes a previously defined transform.
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</para>
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<para>
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To be able to drop a transform, you must own the type and the language.
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These are the same privileges that are required to create a transform.
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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 transform 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>type_name</replaceable></term>
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<listitem>
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<para>
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The name of the data type of the transform.
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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>lang_name</replaceable></term>
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<listitem>
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<para>
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The name of the language of the transform.
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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 transform,
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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 transform if any objects depend on it. This is the
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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-droptransform-examples">
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<title>Examples</title>
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<para>
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To drop the transform for type <type>hstore</type> and language
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<literal>plpython3u</literal>:
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<programlisting>
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DROP TRANSFORM FOR hstore LANGUAGE plpython3u;
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</programlisting></para>
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</refsect1>
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<refsect1 id="sql-droptransform-compat">
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<title>Compatibility</title>
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<para>
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This form of <command>DROP TRANSFORM</command> is a
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<productname>PostgreSQL</productname> extension. See <xref
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linkend="sql-createtransform"/> for details.
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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-createtransform"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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