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Since some preparation work had already been done, the only source changes left were changing empty-element tags like <xref linkend="foo"> to <xref linkend="foo"/>, and changing the DOCTYPE. The source files are still named *.sgml, but they are actually XML files now. Renaming could be considered later. In the build system, the intermediate step to convert from SGML to XML is removed. Everything is build straight from the source files again. The OpenSP (or the old SP) package is no longer needed. The documentation toolchain instructions are updated and are much simpler now. Peter Eisentraut, Alexander Lakhin, Jürgen Purtz
125 lines
2.9 KiB
Text
125 lines
2.9 KiB
Text
<!-- doc/src/sgml/ref/drop_transform.sgml -->
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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>plpythonu</literal>:
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<programlisting>
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DROP TRANSFORM FOR hstore LANGUAGE plpythonu;
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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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