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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/revoke.sgml,v 1.22.2.1 2002/11/21 23:31:58 petere Exp $
PostgreSQL documentation
-->
<refentry id="SQL-REVOKE">
<refmeta>
<refentrytitle id="sql-revoke-title">REVOKE</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>REVOKE</refname>
<refpurpose>remove access privileges</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
REVOKE { { SELECT | INSERT | UPDATE | DELETE | RULE | REFERENCES | TRIGGER }
[,...] | ALL [ PRIVILEGES ] }
ON [ TABLE ] <replaceable class="PARAMETER">tablename</replaceable> [, ...]
FROM { <replaceable class="PARAMETER">username</replaceable> | GROUP <replaceable class="PARAMETER">groupname</replaceable> | PUBLIC } [, ...]
REVOKE { { CREATE | TEMPORARY | TEMP } [,...] | ALL [ PRIVILEGES ] }
ON DATABASE <replaceable>dbname</replaceable> [, ...]
FROM { <replaceable class="PARAMETER">username</replaceable> | GROUP <replaceable class="PARAMETER">groupname</replaceable> | PUBLIC } [, ...]
REVOKE { EXECUTE | ALL [ PRIVILEGES ] }
ON FUNCTION <replaceable>funcname</replaceable> ([<replaceable>type</replaceable>, ...]) [, ...]
FROM { <replaceable class="PARAMETER">username</replaceable> | GROUP <replaceable class="PARAMETER">groupname</replaceable> | PUBLIC } [, ...]
REVOKE { USAGE | ALL [ PRIVILEGES ] }
ON LANGUAGE <replaceable>langname</replaceable> [, ...]
FROM { <replaceable class="PARAMETER">username</replaceable> | GROUP <replaceable class="PARAMETER">groupname</replaceable> | PUBLIC } [, ...]
REVOKE { { CREATE | USAGE } [,...] | ALL [ PRIVILEGES ] }
ON SCHEMA <replaceable>schemaname</replaceable> [, ...]
FROM { <replaceable class="PARAMETER">username</replaceable> | GROUP <replaceable class="PARAMETER">groupname</replaceable> | PUBLIC } [, ...]
</synopsis>
</refsynopsisdiv>
<refsect1 id="SQL-REVOKE-description">
<title>Description</title>
<para>
<command>REVOKE</command> allows the creator of an object to revoke
previously granted permissions from one or more users or groups of users.
The key word <literal>PUBLIC</literal> refers to the implicitly defined
group of all users.
</para>
<para>
Note that any particular user will have the sum
of privileges granted directly to him, privileges granted to any group he
is presently a member of, and privileges granted to
<literal>PUBLIC</literal>. Thus, for example, revoking SELECT privilege
from <literal>PUBLIC</literal> does not necessarily mean that all users
have lost SELECT privilege on the object: those who have it granted
directly or via a group will still have it.
</para>
<para>
See the description of the <xref linkend="sql-grant" endterm="sql-grant-title"> command for
the meaning of the privilege types.
</para>
</refsect1>
<refsect1 id="SQL-REVOKE-notes">
<title>Notes</title>
<para>
Use <xref linkend="app-psql">'s <command>\z</command> command to
display the privileges granted on existing objects. See also <xref
linkend="sql-grant" endterm="sql-grant-title"> for information about the format.
</para>
</refsect1>
<refsect1 id="SQL-REVOKE-examples">
<title>Examples</title>
<para>
Revoke insert privilege for the public on table
<literal>films</literal>:
<programlisting>
REVOKE INSERT ON films FROM PUBLIC;
</programlisting>
</para>
<para>
Revoke all privileges from user <literal>manuel</literal> on view <literal>kinds</literal>:
<programlisting>
REVOKE ALL PRIVILEGES ON kinds FROM manuel;
</programlisting>
</para>
</refsect1>
<refsect1 id="SQL-REVOKE-compatibility">
<title>Compatibility</title>
<refsect2>
<title>SQL92</title>
<para>
The compatibility notes of the <xref linkend="sql-grant" endterm="sql-grant-title"> command
apply analogously to <command>REVOKE</command>. The syntax summary is:
<synopsis>
REVOKE [ GRANT OPTION FOR ] { SELECT | INSERT | UPDATE | DELETE | REFERENCES }
ON <replaceable class="parameter">object</replaceable> [ ( <replaceable class="parameter">column</replaceable> [, ...] ) ]
FROM { PUBLIC | <replaceable class="parameter">username</replaceable> [, ...] }
{ RESTRICT | CASCADE }
</synopsis>
</para>
<para>
If user1 gives a privilege WITH GRANT OPTION to user2,
and user2 gives it to user3 then user1 can revoke
this privilege in cascade using the CASCADE keyword.
If user1 gives a privilege WITH GRANT OPTION to user2,
and user2 gives it to user3, then if user1 tries to revoke
this privilege it fails if he specifies the RESTRICT
keyword.
</para>
</refsect2>
</refsect1>
<refsect1>
<title>See Also</title>
<simpara>
<xref linkend="sql-grant" endterm="sql-grant-title">
</simpara>
</refsect1>
</refentry>
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