GRANT(7)							   SQL Commands 							  GRANT(7)

NAME

       GRANT - define access privileges

SYNOPSIS

       GRANT { { SELECT | INSERT | UPDATE | DELETE | RULE | REFERENCES | TRIGGER }
	   [,...] | ALL [ PRIVILEGES ] }
	   ON [ TABLE ] tablename [, ...]
	   TO { username | GROUP groupname | PUBLIC } [, ...]

       GRANT { { CREATE | TEMPORARY | TEMP } [,...] | ALL [ PRIVILEGES ] }
	   ON DATABASE dbname [, ...]
	   TO { username | GROUP groupname | PUBLIC } [, ...]

       GRANT { EXECUTE | ALL [ PRIVILEGES ] }
	   ON FUNCTION funcname ([type, ...]) [, ...]
	   TO { username | GROUP groupname | PUBLIC } [, ...]

       GRANT { USAGE | ALL [ PRIVILEGES ] }
	   ON LANGUAGE langname [, ...]
	   TO { username | GROUP groupname | PUBLIC } [, ...]

       GRANT { { CREATE | USAGE } [,...] | ALL [ PRIVILEGES ] }
	   ON SCHEMA schemaname [, ...]
	   TO { username | GROUP groupname | PUBLIC } [, ...]

DESCRIPTION

       The  GRANT  command  gives specific permissions on an object (table, view, sequence, database, function, procedural language, or schema) to
       one or more users or groups of users. These permissions are added to those already granted, if any.

       The key word PUBLIC indicates that the privileges are to be granted to all users, including those that may be created later. PUBLIC may	be
       thought	of  as	an implicitly defined group that always includes all users.  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 PUBLIC.

       There is no need to grant privileges to the creator of an object, as the creator has all privileges by default.	(The creator  could,  how-
       ever, choose to revoke some of his own privileges for safety.) Note that the ability to grant and revoke privileges is inherent in the cre-
       ator and cannot be lost. The right to drop an object, or to alter it in any way not described by a grantable right, is likewise inherent in
       the creator, and cannot be granted or revoked.

       Depending  on  the type of object, the initial default privileges may include granting some privileges to PUBLIC.  The default is no public
       access for tables and schemas; TEMP table creation privilege for databases; EXECUTE privilege for functions; and USAGE privilege  for  lan-
       guages.	 The  object  creator  may of course revoke these privileges. (For maximum security, issue the REVOKE in the same transaction that
       creates the object; then there is no window in which another user may use the object.)

       The possible privileges are:

       SELECT Allows SELECT [select(7)] from any column of the specified table, view, or sequence. Also allows the use of COPY [copy(7)]  TO.  For
	      sequences, this privilege also allows the use of the currval function.

       INSERT Allows INSERT [insert(7)] of a new row into the specified table. Also allows COPY [copy(7)] FROM.

       UPDATE Allows  UPDATE  [update(7)]  of  any  column of the specified table. SELECT ... FOR UPDATE also requires this privilege (besides the
	      SELECT privilege). For sequences, this privilege allows the use of the nextval and setval functions.

       DELETE Allows DELETE [delete(7)] of a row from the specified table.

       RULE   Allows the creation of a rule on the table/view. (See CREATE RULE [create_rule(7)] statement.)

       REFERENCES
	      To create a foreign key constraint, it is necessary to have this privilege on both the referencing and referenced tables.

       TRIGGER
	      Allows the creation of a trigger on the specified table. (See CREATE TRIGGER [create_trigger(7)] statement.)

       CREATE For databases, allows new schemas to be created within the database.

	      For schemas, allows new objects to be created within the schema.	To rename an existing object, you must own  the  object  and  have
	      this privilege for the containing schema.

       TEMPORARY

       TEMP   Allows temporary tables to be created while using the database.

       EXECUTE
	      Allows  the use of the specified function and the use of any operators that are implemented on top of the function. This is the only
	      type of privilege that is applicable to functions.  (This syntax works for aggregate functions, as well.)

       USAGE  For procedural languages, allows the use of the specified language for the creation of functions in that language. This is the  only
	      type of privilege that is applicable to procedural languages.

	      For  schemas,  allows access to objects contained in the specified schema (assuming that the objects' own privilege requirements are
	      also met). Essentially this allows the grantee to ``look up'' objects within the schema.

       ALL PRIVILEGES
	      Grant all of the privileges applicable to the object at once.  The PRIVILEGES key word is  optional  in  PostgreSQL,  though  it	is
	      required by strict SQL.

       The privileges required by other commands are listed on the reference page of the respective command.

NOTES

       The REVOKE [revoke(7)] command is used to revoke access privileges.

       It  should  be  noted  that  database  superusers can access all objects regardless of object privilege settings. This is comparable to the
       rights of root in a Unix system.  As with root, it's unwise to operate as a superuser except when absolutely necessary.

       Currently, to grant privileges in PostgreSQL to only a few columns, you must create a view having the desired columns and then grant privi-
       leges to that view.

       Use psql(1)'s dp command to obtain information about existing privileges, for example:

       lusitania=> dp mytable
	       Access privileges for database "lusitania"
	Schema |  Table  |	     Access privileges
       --------+---------+---------------------------------------
	public | mytable | {=r,miriam=arwdRxt,"group todos=arw"}
       (1 row)

       The entries shown by dp are interpreted thus:

		     =xxxx -- privileges granted to PUBLIC
		uname=xxxx -- privileges granted to a user
	  group gname=xxxx -- privileges granted to a group

			 r -- SELECT ("read")
			 w -- UPDATE ("write")
			 a -- INSERT ("append")
			 d -- DELETE
			 R -- RULE
			 x -- REFERENCES
			 t -- TRIGGER
			 X -- EXECUTE
			 U -- USAGE
			 C -- CREATE
			 T -- TEMPORARY
		   arwdRxt -- ALL PRIVILEGES (for tables)

       The above example display would be seen by user miriam after creating table mytable and doing

       GRANT SELECT ON mytable TO PUBLIC;
       GRANT SELECT,UPDATE,INSERT ON mytable TO GROUP todos;

       If  the ``Access privileges'' column is empty for a given object, it means the object has default privileges (that is, its privileges field
       is NULL). Default privileges always include all privileges for the owner, and may include some  privileges  for	PUBLIC	depending  on  the
       object  type,  as  explained above. The first GRANT or REVOKE on an object will instantiate the default privileges (producing, for example,
       {=,miriam=arwdRxt}) and then modify them per the specified request.

EXAMPLES

       Grant insert privilege to all users on table films:

       GRANT INSERT ON films TO PUBLIC;

       Grant all privileges to user manuel on view kinds:

       GRANT ALL PRIVILEGES ON kinds TO manuel;

COMPATIBILITY

   SQL92
       The PRIVILEGES key word in ALL PRIVILEGES is required. SQL does not support setting the privileges on more than one table per command.

       The SQL92 syntax for GRANT allows setting privileges for individual columns within a table, and allows setting a  privilege  to	grant  the
       same privileges to others:

       GRANT privilege [, ...]
	   ON object [ ( column [, ...] ) ] [, ...]
	   TO { PUBLIC | username [, ...] } [ WITH GRANT OPTION ]

       SQL allows to grant the USAGE privilege on other kinds of objects: CHARACTER SET, COLLATION, TRANSLATION, DOMAIN.

       The TRIGGER privilege was introduced in SQL99. The RULE privilege is a PostgreSQL extension.

SEE ALSO

       REVOKE [revoke(7)]

SQL - Language Statements					    2002-11-22								  GRANT(7)