<REFENTRY ID="SQL-REVOKE">
<REFMETA>
<REFENTRYTITLE>
REVOKE
</REFENTRYTITLE>
<REFMISCINFO>SQL - Language Statements</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>
REVOKE
</REFNAME>
<REFPURPOSE>
Revokes access privilege from a user, a group or all users.
</REFPURPOSE>

<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1998-09-01</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
<REPLACEABLE CLASS="PARAMETER">
</REPLACEABLE>
REVOKE <REPLACEABLE CLASS="PARAMETER">privilege</REPLACEABLE> [, ...]
    ON <REPLACEABLE CLASS="PARAMETER">object</REPLACEABLE> [, ...]
    FROM { PUBLIC | GROUP <REPLACEABLE CLASS="PARAMETER">group</REPLACEABLE> | <REPLACEABLE CLASS="PARAMETER">username</REPLACEABLE> }
</SYNOPSIS>

<REFSECT2 ID="R2-SQL-REVOKE-1">
<REFSECT2INFO>
<DATE>1998-09-01</DATE>
</REFSECT2INFO>
<TITLE>
Inputs
</TITLE>
<PARA>
</PARA>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
<REPLACEABLE CLASS="PARAMETER">privilege</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
         The possible privileges are:

<VARIABLELIST>
<VARLISTENTRY>
<TERM>
SELECT
</TERM>
<LISTITEM>
<PARA>
Privilege to access all of the columns of a specific
                        table/view.
</PARA>
</LISTITEM>
</VARLISTENTRY>

<VARLISTENTRY>
<TERM>
INSERT
</TERM>
<LISTITEM>
<PARA>
Privilege to insert data into all columns of a
                        specific table.

<VARLISTENTRY>
<TERM>
UPDATE
</TERM>
<LISTITEM>
<PARA>
Privilege to update all columns of a specific
                        table.

<VARLISTENTRY>
<TERM>
DELETE
</TERM>
<LISTITEM>
<PARA>
Privilege to delete rows from a specific table.

<VARLISTENTRY>
<TERM>
RULE
</TERM>
<LISTITEM>
<PARA>
Privilege to define rules on table/view.
(See the <command>CREATE RULE</command> statement).

<VARLISTENTRY>
<TERM>
ALL
</TERM>
<LISTITEM>
<PARA>
Rescind all privileges.

</VARIABLELIST>

<VARLISTENTRY>
<TERM>
<REPLACEABLE CLASS="PARAMETER">object</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
The name of an object from which to revoke access.
          The possible objects are:
<simplelist>
<member>
              table 
<member>
              view 
<member>
              sequence 
<member>
              index  
</simplelist>

<VARLISTENTRY>
<TERM>
<REPLACEABLE CLASS="PARAMETER">group</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
          The name of a group from whom to revoke privileges.
</PARA>
</LISTITEM>
</VARLISTENTRY>

<VARLISTENTRY>
<TERM>
<REPLACEABLE CLASS="PARAMETER">username</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
The name of a user from whom revoke privileges. Use the PUBLIC keyword
to specify all users.
</PARA>
</LISTITEM>
</VARLISTENTRY>

<VARLISTENTRY>
<TERM>
PUBLIC
</TERM>
<LISTITEM>
<PARA>
Rescind the specified privilege(s) for all users.

</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>

</REFSECT2>

<REFSECT2 ID="R2-SQL-REVOKE-2">
<REFSECT2INFO>
<DATE>1998-04-15</DATE>
</REFSECT2INFO>
<TITLE>
Outputs
</TITLE>
<PARA>
</PARA>

<VARIABLELIST>
<VARLISTENTRY>
<TERM>
CHANGE
</TERM>
<LISTITEM>
<PARA>
          Message returned if successfully.

<VARLISTENTRY>
<TERM>
ERROR
</TERM>
<LISTITEM>
<PARA>
          Message returned if object is not available or impossible
          to revoke privileges from a group or users.

</VARIABLELIST>

</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-SQL-REVOKE-1">
<REFSECT1INFO>
<DATE>1998-09-01</DATE>
</REFSECT1INFO>
<TITLE>
Description
</TITLE>
<PARA>
   REVOKE allows creator of an object to revoke permissions granted
   before, from all users (via PUBLIC) or a certain user or group.

<REFSECT2 ID="R2-SQL-REVOKE-3">
<REFSECT2INFO>
<DATE>1998-04-15</DATE>
</REFSECT2INFO>
<TITLE>
Notes
</TITLE>
<PARA>
   Refer to psql \z command for further information about permissions 
         on existing objects:

<programlisting>
   Database    = lusitania
   +------------------+---------------------------------------------+
   |  Relation        |        Grant/Revoke Permissions             |
   +------------------+---------------------------------------------+
   | mytable          | {"=rw","miriam=arwR","group todos=rw"}      |
   +------------------+---------------------------------------------+
   Legend:
         uname=arwR -- privileges granted to a user
   group gname=arwR -- privileges granted to a GROUP
              =arwR -- privileges granted to PUBLIC

                  r -- SELECT
                  w -- UPDATE/DELETE
                  a -- INSERT
                  R -- RULE
               arwR -- ALL
</programlisting>

<tip>
<para>
Currently, to create a GROUP you have to insert 
          data manually into table pg_group as:
<programlisting>          
          INSERT INTO pg_group VALUES ('todos');
          CREATE USER miriam IN GROUP todos;
</programlisting>
</tip>

</REFSECT2>

<REFSECT1 ID="R1-SQL-REVOKE-2">
<TITLE>
Usage
</TITLE>
<PARA>
<ProgramListing>
   -- revoke insert privilege from all users on table films:
   --
   REVOKE INSERT ON films FROM PUBLIC;

   -- revoke all privileges from user manuel on view kinds:
   --
   REVOKE ALL ON kinds FROM manuel;
</ProgramListing>

</REFSECT1>

<REFSECT1 ID="R1-SQL-REVOKE-3">
<TITLE>
Compatibility
</TITLE>
<PARA>
</PARA>

<REFSECT2 ID="R2-SQL-REVOKE-4">
<REFSECT2INFO>
<DATE>1998-09-01</DATE>
</REFSECT2INFO>
<TITLE>
SQL92
</TITLE>
<PARA>
   The SQL92 syntax for REVOKE has additional capabilities for rescinding
privileges, including those on individual columns in tables:

<variablelist>
<varlistentry>
<term>
<synopsis>
REVOKE { SELECT | DELETE | USAGE | ALL PRIVILEGES } [, ...]
    ON <replaceable class="parameter">object</replaceable>
    FROM { PUBLIC | <replaceable class="parameter">username</replaceable> [, ...] } { RESTRICT | CASCADE }
REVOKE { INSERT | UPDATE | REFERENCES } [, ...] [ ( <replaceable class="parameter">column</replaceable> [, ...] ) ]
    ON <replaceable class="parameter">object</replaceable>
    FROM { PUBLIC | <replaceable class="parameter">username</replaceable> [, ...] } { RESTRICT | CASCADE }
</synopsis>
<listitem>
<para>
Refer to the <command>GRANT</command> command for details on individual fields.

<varlistentry>
<term>
<synopsis>
REVOKE GRANT OPTION FOR <replaceable class="parameter">privilege</replaceable> [, ...]
    ON <replaceable class="parameter">object</replaceable>
    FROM { PUBLIC | <replaceable class="parameter">username</replaceable> [, ...] } { RESTRICT | CASCADE }
</synopsis>
<listitem>
<para>
Rescinds authority for a user to grant the specified privilege to others.
Refer to the <command>GRANT</command> command for details on individual fields.

</variablelist>

<para>
      The possible objects are:
<simplelist>
<member>          [ TABLE ] table/view
<member>          CHARACTER SET character-set
<member>          COLLATION collation
<member>          TRANSLATION translation
<member>          DOMAIN domain
</simplelist>

<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 try revoke
                    this privilege it fails if he/she specify the RESTRICT
                    keyword.
</REFENTRY>

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