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| $PostgreSQL: pgsql/doc/src/sgml/ref/drop_index.sgml,v 1.23 2006/09/16 00:30:18 momjian 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> |
| |
| <indexterm zone="sql-dropindex"> |
| <primary>DROP INDEX</primary> |
| </indexterm> |
| |
| <refsynopsisdiv> |
| <synopsis> |
| DROP INDEX [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable> [, ...] [ CASCADE | RESTRICT ] |
| </synopsis> |
| </refsynopsisdiv> |
| |
| <refsect1> |
| <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> |
| </refsect1> |
| |
| <refsect1> |
| <title>Parameters</title> |
| |
| <variablelist> |
| <varlistentry> |
| <term><literal>IF EXISTS</literal></term> |
| <listitem> |
| <para> |
| Do not throw an error if the index does not exist. A notice is issued |
| in this case. |
| </para> |
| </listitem> |
| </varlistentry> |
| |
| <varlistentry> |
| <term><replaceable class="PARAMETER">name</replaceable></term> |
| <listitem> |
| <para> |
| The name (optionally schema-qualified) of an index to remove. |
| </para> |
| </listitem> |
| </varlistentry> |
| |
| <varlistentry> |
| <term><literal>CASCADE</literal></term> |
| <listitem> |
| <para> |
| Automatically drop objects that depend on the index. |
| </para> |
| </listitem> |
| </varlistentry> |
| |
| <varlistentry> |
| <term><literal>RESTRICT</literal></term> |
| <listitem> |
| <para> |
| Refuse to drop the index if any objects depend on it. This is |
| the default. |
| </para> |
| </listitem> |
| </varlistentry> |
| </variablelist> |
| </refsect1> |
| |
| <refsect1> |
| <title>Examples</title> |
| |
| <para> |
| This command will remove the index <literal>title_idx</literal>: |
| |
| <programlisting> |
| DROP INDEX title_idx; |
| </programlisting> |
| </para> |
| </refsect1> |
| |
| <refsect1> |
| <title>Compatibility</title> |
| |
| <para> |
| <command>DROP INDEX</command> is a |
| <productname>PostgreSQL</productname> language extension. There |
| are no provisions for indexes in the SQL standard. |
| </para> |
| </refsect1> |
| |
| <refsect1> |
| <title>See Also</title> |
| |
| <simplelist type="inline"> |
| <member><xref linkend="sql-createindex" endterm="sql-createindex-title"></member> |
| </simplelist> |
| </refsect1> |
| |
| </refentry> |