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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 $
PostgreSQL documentation
-->
<refentry id="SQL-DROPINDEX">
<refmeta>
<refentrytitle id="SQL-DROPINDEX-TITLE">DROP INDEX</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
DROP INDEX
</refname>
<refpurpose>
remove an index
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>1999-07-20</date>
</refsynopsisdivinfo>
<synopsis>
DROP INDEX <replaceable class="PARAMETER">index_name</replaceable> [, ...] [ CASCADE | RESTRICT ]
</synopsis>
<refsect2 id="R2-SQL-DROPINDEX-1">
<refsect2info>
<date>1998-04-15</date>
</refsect2info>
<title>
Inputs
</title>
<para>
<variablelist>
<varlistentry>
<term><replaceable class="PARAMETER">index_name</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of an index to remove.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>CASCADE</term>
<listitem>
<para>
Automatically drop objects that depend on the index.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>RESTRICT</term>
<listitem>
<para>
Refuse to drop the index if there are any dependent objects.
This is the default.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-DROPINDEX-2">
<refsect2info>
<date>1998-04-15</date>
</refsect2info>
<title>
Outputs
</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>
DROP INDEX
</computeroutput></term>
<listitem>
<para>
The message returned if the command completes successfully.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>
ERROR: index "<replaceable class="PARAMETER">index_name</replaceable>" does not exist
</computeroutput></term>
<listitem>
<para>
This message occurs if <replaceable class="PARAMETER">index_name</replaceable>
is not an index in the database.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-DROPINDEX-1">
<refsect1info>
<date>1998-04-15</date>
</refsect1info>
<title>
Description
</title>
<para>
<command>DROP INDEX</command> drops an existing index from the database
system. To execute this command you must be the owner of
the index.
</para>
<refsect2 id="R2-SQL-DROPINDEX-3">
<refsect2info>
<date>1998-04-15</date>
</refsect2info>
<title>
Notes
</title>
<para>
<command>DROP INDEX</command> is a <productname>PostgreSQL</productname>
language extension.
</para>
<para>
Refer to
<xref linkend="sql-createindex" endterm="sql-createindex-title">
for information on how to create indexes.
</para>
</refsect2>
</refsect1>
<refsect1 id="R1-SQL-DROPINDEX-2">
<title>
Usage
</title>
<para>
This command will remove the <literal>title_idx</literal> index:
<programlisting>
DROP INDEX title_idx;
</programlisting>
</para>
</refsect1>
<refsect1 id="R1-SQL-DROPINDEX-3">
<title>
Compatibility
</title>
<refsect2 id="R2-SQL-DROPINDEX-4">
<refsect2info>
<date>1998-04-15</date>
</refsect2info>
<title>
SQL92
</title>
<para>
<acronym>SQL92</acronym> defines commands by which to access
a generic relational database.
Indexes are an implementation-dependent feature and hence
there are no index-specific commands or definitions in the
<acronym>SQL92</acronym> language.
</para>
</refsect2>
</refsect1>
</refentry>
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