Provided by: postgresql-client-9.5_9.5.2-1_amd64 bug

NAME

       GRANT - define access privileges

SYNOPSIS

       GRANT { { SELECT | INSERT | UPDATE | DELETE | TRUNCATE | REFERENCES | TRIGGER }
           [, ...] | ALL [ PRIVILEGES ] }
           ON { [ TABLE ] table_name [, ...]
                | ALL TABLES IN SCHEMA schema_name [, ...] }
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { { SELECT | INSERT | UPDATE | REFERENCES } ( column_name [, ...] )
           [, ...] | ALL [ PRIVILEGES ] ( column_name [, ...] ) }
           ON [ TABLE ] table_name [, ...]
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { { USAGE | SELECT | UPDATE }
           [, ...] | ALL [ PRIVILEGES ] }
           ON { SEQUENCE sequence_name [, ...]
                | ALL SEQUENCES IN SCHEMA schema_name [, ...] }
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { { CREATE | CONNECT | TEMPORARY | TEMP } [, ...] | ALL [ PRIVILEGES ] }
           ON DATABASE database_name [, ...]
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { USAGE | ALL [ PRIVILEGES ] }
           ON DOMAIN domain_name [, ...]
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { USAGE | ALL [ PRIVILEGES ] }
           ON FOREIGN DATA WRAPPER fdw_name [, ...]
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { USAGE | ALL [ PRIVILEGES ] }
           ON FOREIGN SERVER server_name [, ...]
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { EXECUTE | ALL [ PRIVILEGES ] }
           ON { FUNCTION function_name ( [ [ argmode ] [ arg_name ] arg_type [, ...] ] ) [, ...]
                | ALL FUNCTIONS IN SCHEMA schema_name [, ...] }
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { USAGE | ALL [ PRIVILEGES ] }
           ON LANGUAGE lang_name [, ...]
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { { SELECT | UPDATE } [, ...] | ALL [ PRIVILEGES ] }
           ON LARGE OBJECT loid [, ...]
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { { CREATE | USAGE } [, ...] | ALL [ PRIVILEGES ] }
           ON SCHEMA schema_name [, ...]
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { CREATE | ALL [ PRIVILEGES ] }
           ON TABLESPACE tablespace_name [, ...]
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       GRANT { USAGE | ALL [ PRIVILEGES ] }
           ON TYPE type_name [, ...]
           TO role_specification [, ...] [ WITH GRANT OPTION ]

       where role_specification can be:

           [ GROUP ] role_name
         | PUBLIC
         | CURRENT_USER
         | SESSION_USER

       GRANT role_name [, ...] TO role_name [, ...] [ WITH ADMIN OPTION ]

DESCRIPTION

       The GRANT command has two basic variants: one that grants privileges on a database object
       (table, column, view, foreign table, sequence, database, foreign-data wrapper, foreign
       server, function, procedural language, schema, or tablespace), and one that grants
       membership in a role. These variants are similar in many ways, but they are different
       enough to be described separately.

   GRANT on Database Objects
       This variant of the GRANT command gives specific privileges on a database object to one or
       more roles. These privileges are added to those already granted, if any.

       There is also an option to grant privileges on all objects of the same type within one or
       more schemas. This functionality is currently supported only for tables, sequences, and
       functions (but note that ALL TABLES is considered to include views and foreign tables).

       The key word PUBLIC indicates that the privileges are to be granted to all roles,
       including those that might be created later.  PUBLIC can be thought of as an implicitly
       defined group that always includes all roles. Any particular role will have the sum of
       privileges granted directly to it, privileges granted to any role it is presently a member
       of, and privileges granted to PUBLIC.

       If WITH GRANT OPTION is specified, the recipient of the privilege can in turn grant it to
       others. Without a grant option, the recipient cannot do that. Grant options cannot be
       granted to PUBLIC.

       There is no need to grant privileges to the owner of an object (usually the user that
       created it), as the owner has all privileges by default. (The owner could, however, choose
       to revoke some of his own privileges for safety.)

       The right to drop an object, or to alter its definition in any way, is not treated as a
       grantable privilege; it is inherent in the owner, and cannot be granted or revoked.
       (However, a similar effect can be obtained by granting or revoking membership in the role
       that owns the object; see below.) The owner implicitly has all grant options for the
       object, too.

       PostgreSQL grants default privileges on some types of objects to PUBLIC. No privileges are
       granted to PUBLIC by default on tables, columns, schemas or tablespaces. For other types,
       the default privileges granted to PUBLIC are as follows: CONNECT and CREATE TEMP TABLE for
       databases; EXECUTE privilege for functions; and USAGE privilege for languages. The object
       owner can, of course, REVOKE both default and expressly granted privileges. (For maximum
       security, issue the REVOKE in the same transaction that creates the object; then there is
       no window in which another user can use the object.) Also, these initial default privilege
       settings can be changed using the ALTER DEFAULT PRIVILEGES (ALTER_DEFAULT_PRIVILEGES(7))
       command.

       The possible privileges are:

       SELECT
           Allows SELECT(7) from any column, or the specific columns listed, of the specified
           table, view, or sequence. Also allows the use of COPY(7) TO. This privilege is also
           needed to reference existing column values in UPDATE(7) or DELETE(7). For sequences,
           this privilege also allows the use of the currval function. For large objects, this
           privilege allows the object to be read.

       INSERT
           Allows INSERT(7) of a new row into the specified table. If specific columns are
           listed, only those columns may be assigned to in the INSERT command (other columns
           will therefore receive default values). Also allows COPY(7) FROM.

       UPDATE
           Allows UPDATE(7) of any column, or the specific columns listed, of the specified
           table. (In practice, any nontrivial UPDATE command will require SELECT privilege as
           well, since it must reference table columns to determine which rows to update, and/or
           to compute new values for columns.)  SELECT ... FOR UPDATE and SELECT ... FOR SHARE
           also require this privilege on at least one column, in addition to the SELECT
           privilege. For sequences, this privilege allows the use of the nextval and setval
           functions. For large objects, this privilege allows writing or truncating the object.

       DELETE
           Allows DELETE(7) of a row from the specified table. (In practice, any nontrivial
           DELETE command will require SELECT privilege as well, since it must reference table
           columns to determine which rows to delete.)

       TRUNCATE
           Allows TRUNCATE(7) on the specified table.

       REFERENCES
           To create a foreign key constraint, it is necessary to have this privilege on both the
           referencing and referenced columns. The privilege may be granted for all columns of a
           table, or just specific columns.

       TRIGGER
           Allows the creation of a trigger on the specified table. (See the 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.

           For tablespaces, allows tables, indexes, and temporary files to be created within the
           tablespace, and allows databases to be created that have the tablespace as their
           default tablespace. (Note that revoking this privilege will not alter the placement of
           existing objects.)

       CONNECT
           Allows the user to connect to the specified database. This privilege is checked at
           connection startup (in addition to checking any restrictions imposed by pg_hba.conf).

       TEMPORARY
       TEMP
           Allows temporary tables to be created while using the specified 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. Without this permission, it is still
           possible to see the object names, e.g. by querying the system tables. Also, after
           revoking this permission, existing backends might have statements that have previously
           performed this lookup, so this is not a completely secure way to prevent object
           access.

           For sequences, this privilege allows the use of the currval and nextval functions.

           For types and domains, this privilege allow the use of the type or domain in the
           creation of tables, functions, and other schema objects. (Note that it does not
           control general “usage” of the type, such as values of the type appearing in queries.
           It only prevents objects from being created that depend on the type. The main purpose
           of the privilege is controlling which users create dependencies on a type, which could
           prevent the owner from changing the type later.)

           For foreign-data wrappers, this privilege enables the grantee to create new servers
           using that foreign-data wrapper.

           For servers, this privilege enables the grantee to create foreign tables using the
           server, and also to create, alter, or drop his own user's user mappings associated
           with that server.

       ALL PRIVILEGES
           Grant all of the available privileges 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.

   GRANT on Roles
       This variant of the GRANT command grants membership in a role to one or more other roles.
       Membership in a role is significant because it conveys the privileges granted to a role to
       each of its members.

       If WITH ADMIN OPTION is specified, the member can in turn grant membership in the role to
       others, and revoke membership in the role as well. Without the admin option, ordinary
       users cannot do that. A role is not considered to hold WITH ADMIN OPTION on itself, but it
       may grant or revoke membership in itself from a database session where the session user
       matches the role. Database superusers can grant or revoke membership in any role to
       anyone. Roles having CREATEROLE privilege can grant or revoke membership in any role that
       is not a superuser.

       Unlike the case with privileges, membership in a role cannot be granted to PUBLIC. Note
       also that this form of the command does not allow the noise word GROUP.

NOTES

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

       Since PostgreSQL 8.1, the concepts of users and groups have been unified into a single
       kind of entity called a role. It is therefore no longer necessary to use the keyword GROUP
       to identify whether a grantee is a user or a group.  GROUP is still allowed in the
       command, but it is a noise word.

       A user may perform SELECT, INSERT, etc. on a column if he holds that privilege for either
       the specific column or its whole table. Granting the privilege at the table level and then
       revoking it for one column will not do what you might wish: the table-level grant is
       unaffected by a column-level operation.

       When a non-owner of an object attempts to GRANT privileges on the object, the command will
       fail outright if the user has no privileges whatsoever on the object. As long as some
       privilege is available, the command will proceed, but it will grant only those privileges
       for which the user has grant options. The GRANT ALL PRIVILEGES forms will issue a warning
       message if no grant options are held, while the other forms will issue a warning if grant
       options for any of the privileges specifically named in the command are not held. (In
       principle these statements apply to the object owner as well, but since the owner is
       always treated as holding all grant options, the cases can never occur.)

       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.

       If a superuser chooses to issue a GRANT or REVOKE command, the command is performed as
       though it were issued by the owner of the affected object. In particular, privileges
       granted via such a command will appear to have been granted by the object owner. (For role
       membership, the membership appears to have been granted by the containing role itself.)

       GRANT and REVOKE can also be done by a role that is not the owner of the affected object,
       but is a member of the role that owns the object, or is a member of a role that holds
       privileges WITH GRANT OPTION on the object. In this case the privileges will be recorded
       as having been granted by the role that actually owns the object or holds the privileges
       WITH GRANT OPTION. For example, if table t1 is owned by role g1, of which role u1 is a
       member, then u1 can grant privileges on t1 to u2, but those privileges will appear to have
       been granted directly by g1. Any other member of role g1 could revoke them later.

       If the role executing GRANT holds the required privileges indirectly via more than one
       role membership path, it is unspecified which containing role will be recorded as having
       done the grant. In such cases it is best practice to use SET ROLE to become the specific
       role you want to do the GRANT as.

       Granting permission on a table does not automatically extend permissions to any sequences
       used by the table, including sequences tied to SERIAL columns. Permissions on sequences
       must be set separately.

       Use psql(1)'s \dp command to obtain information about existing privileges for tables and
       columns. For example:

           => \dp mytable
                                         Access privileges
            Schema |  Name   | Type  |   Access privileges   | Column access privileges
           --------+---------+-------+-----------------------+--------------------------
            public | mytable | table | miriam=arwdDxt/miriam | col1:
                                     : =r/miriam             :   miriam_rw=rw/miriam
                                     : admin=arw/miriam
           (1 row)

       The entries shown by \dp are interpreted thus:

           rolename=xxxx -- privileges granted to a role
                   =xxxx -- privileges granted to PUBLIC

                       r -- SELECT ("read")
                       w -- UPDATE ("write")
                       a -- INSERT ("append")
                       d -- DELETE
                       D -- TRUNCATE
                       x -- REFERENCES
                       t -- TRIGGER
                       X -- EXECUTE
                       U -- USAGE
                       C -- CREATE
                       c -- CONNECT
                       T -- TEMPORARY
                 arwdDxt -- ALL PRIVILEGES (for tables, varies for other objects)
                       * -- grant option for preceding privilege

                   /yyyy -- role that granted this privilege

       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 admin;
           GRANT SELECT (col1), UPDATE (col1) ON mytable TO miriam_rw;

       For non-table objects there are other \d commands that can display their privileges.

       If the “Access privileges” column is empty for a given object, it means the object has
       default privileges (that is, its privileges column is null). Default privileges always
       include all privileges for the owner, and can 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=arwdDxt/miriam}) and
       then modify them per the specified request. Similarly, entries are shown in “Column access
       privileges” only for columns with nondefault privileges. (Note: for this purpose, “default
       privileges” always means the built-in default privileges for the object's type. An object
       whose privileges have been affected by an ALTER DEFAULT PRIVILEGES command will always be
       shown with an explicit privilege entry that includes the effects of the ALTER.)

       Notice that the owner's implicit grant options are not marked in the access privileges
       display. A * will appear only when grant options have been explicitly granted to someone.

EXAMPLES

       Grant insert privilege to all users on table films:

           GRANT INSERT ON films TO PUBLIC;

       Grant all available privileges to user manuel on view kinds:

           GRANT ALL PRIVILEGES ON kinds TO manuel;

       Note that while the above will indeed grant all privileges if executed by a superuser or
       the owner of kinds, when executed by someone else it will only grant those permissions for
       which the someone else has grant options.

       Grant membership in role admins to user joe:

           GRANT admins TO joe;

COMPATIBILITY

       According to the SQL standard, the PRIVILEGES key word in ALL PRIVILEGES is required. The
       SQL standard does not support setting the privileges on more than one object per command.

       PostgreSQL allows an object owner to revoke his own ordinary privileges: for example, a
       table owner can make the table read-only to himself by revoking his own INSERT, UPDATE,
       DELETE, and TRUNCATE privileges. This is not possible according to the SQL standard. The
       reason is that PostgreSQL treats the owner's privileges as having been granted by the
       owner to himself; therefore he can revoke them too. In the SQL standard, the owner's
       privileges are granted by an assumed entity “_SYSTEM”. Not being “_SYSTEM”, the owner
       cannot revoke these rights.

       According to the SQL standard, grant options can be granted to PUBLIC; PostgreSQL only
       supports granting grant options to roles.

       The SQL standard provides for a USAGE privilege on other kinds of objects: character sets,
       collations, translations.

       In the SQL standard, sequences only have a USAGE privilege, which controls the use of the
       NEXT VALUE FOR expression, which is equivalent to the function nextval in PostgreSQL. The
       sequence privileges SELECT and UPDATE are PostgreSQL extensions. The application of the
       sequence USAGE privilege to the currval function is also a PostgreSQL extension (as is the
       function itself).

       Privileges on databases, tablespaces, schemas, and languages are PostgreSQL extensions.

SEE ALSO

       REVOKE(7), ALTER DEFAULT PRIVILEGES (ALTER_DEFAULT_PRIVILEGES(7))