GRANT SQL - Language Statements GRANT define access privileges 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 } [, ...] 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. Users other than the creator of an object do not have any access privileges to the object unless the creator grants permissions. There is no need to grant privileges to the creator of an object, as the creator automatically holds all privileges. (The creator could, however, choose to revoke some of his own privileges for safety. Note that the ability to grant and revoke privileges is inherent in the creator and cannot be lost. The right to drop the object is likewise inherent in the creator, and cannot be granted or revoked.) The possible privileges are: SELECT Allows from any column of the specified table, view, or sequence. Also allows the use of TO. For sequences, this privilege also allows the use of the currval function. INSERT Allows of a new row into the specified table. Also allows FROM. UPDATE Allows 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 of a row from the specified table. RULE Allows the creation of a rule on the table/view. (See statement.) REFERENCES To create a table with a foreign key constraint, it is necessary to have this privilege on the table with the referenced key. TRIGGER Allows the creation of a trigger on the specified table. (See 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. The 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 privileges to that view. Use '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). Currently, default privileges are interpreted the same way for all object types: all privileges for the owner and no privileges for anyone else. The first GRANT on an object will instantiate this default (producing, for example, {=,miriam=arwdRxt}) and then modify it per the specified request. 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; 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.