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7c6df91dda
pg_relcheck is gone; CHECK, UNIQUE, PRIMARY KEY, and FOREIGN KEY constraints all have real live entries in pg_constraint. pg_depend exists, and RESTRICT/CASCADE options work on most kinds of DROP; however, pg_depend is not yet very well populated with dependencies. (Most of the ones that are present at this point just replace formerly hardwired associations, such as the implicit drop of a relation's pg_type entry when the relation is dropped.) Need to add more logic to create dependency entries, improve pg_dump to dump constraints in place of indexes and triggers, and add some regression tests.
185 lines
4.1 KiB
Plaintext
185 lines
4.1 KiB
Plaintext
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_index.sgml,v 1.16 2002/07/12 18:43:13 tgl Exp $
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PostgreSQL documentation
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-->
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<refentry id="SQL-DROPINDEX">
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<refmeta>
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<refentrytitle id="SQL-DROPINDEX-TITLE">DROP INDEX</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>
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DROP INDEX
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</refname>
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<refpurpose>
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remove an index
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</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<refsynopsisdivinfo>
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<date>1999-07-20</date>
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</refsynopsisdivinfo>
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<synopsis>
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DROP INDEX <replaceable class="PARAMETER">index_name</replaceable> [, ...] [ CASCADE | RESTRICT ]
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</synopsis>
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<refsect2 id="R2-SQL-DROPINDEX-1">
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<refsect2info>
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<date>1998-04-15</date>
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</refsect2info>
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<title>
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Inputs
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</title>
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<para>
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<variablelist>
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<varlistentry>
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<term><replaceable class="PARAMETER">index_name</replaceable></term>
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<listitem>
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<para>
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The name (optionally schema-qualified) of an index 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>CASCADE</term>
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<listitem>
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<para>
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Automatically drop objects that depend on the index.
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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>RESTRICT</term>
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<listitem>
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<para>
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Refuse to drop the index if there are any dependent objects.
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This is 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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</para>
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</refsect2>
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<refsect2 id="R2-SQL-DROPINDEX-2">
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<refsect2info>
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<date>1998-04-15</date>
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</refsect2info>
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<title>
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Outputs
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</title>
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<para>
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<variablelist>
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<varlistentry>
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<term><computeroutput>
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DROP INDEX
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</computeroutput></term>
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<listitem>
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<para>
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The message returned if the command completes successfully.
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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><computeroutput>
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ERROR: index "<replaceable class="PARAMETER">index_name</replaceable>" does not exist
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</computeroutput></term>
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<listitem>
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<para>
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This message occurs if <replaceable class="PARAMETER">index_name</replaceable>
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is not an index in the database.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect2>
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</refsynopsisdiv>
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<refsect1 id="R1-SQL-DROPINDEX-1">
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<refsect1info>
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<date>1998-04-15</date>
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</refsect1info>
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<title>
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Description
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</title>
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<para>
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<command>DROP INDEX</command> drops an existing index from the database
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system. To execute this command you must be the owner of
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the index.
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</para>
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<refsect2 id="R2-SQL-DROPINDEX-3">
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<refsect2info>
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<date>1998-04-15</date>
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</refsect2info>
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<title>
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Notes
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</title>
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<para>
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<command>DROP INDEX</command> is a <productname>PostgreSQL</productname>
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language extension.
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</para>
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<para>
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Refer to
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<xref linkend="sql-createindex" endterm="sql-createindex-title">
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for information on how to create indexes.
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</para>
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</refsect2>
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</refsect1>
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<refsect1 id="R1-SQL-DROPINDEX-2">
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<title>
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Usage
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</title>
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<para>
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This command will remove the <literal>title_idx</literal> index:
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<programlisting>
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DROP INDEX title_idx;
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</programlisting>
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</para>
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</refsect1>
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<refsect1 id="R1-SQL-DROPINDEX-3">
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<title>
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Compatibility
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</title>
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<refsect2 id="R2-SQL-DROPINDEX-4">
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<refsect2info>
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<date>1998-04-15</date>
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</refsect2info>
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<title>
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SQL92
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</title>
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<para>
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<acronym>SQL92</acronym> defines commands by which to access
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a generic relational database.
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Indexes are an implementation-dependent feature and hence
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there are no index-specific commands or definitions in the
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<acronym>SQL92</acronym> language.
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</para>
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</refsect2>
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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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