Changes a role name or membership.
ALTER GROUP <groupname> ADD USER <username> [, ... ] ALTER GROUP <groupname> DROP USER <username> [, ... ] ALTER GROUP <groupname> RENAME TO <newname>
ALTER GROUP changes the attributes of a user group. This is an obsolete command, though still accepted for backwards compatibility, because users and groups are superseded by the more general concept of roles. See ALTER ROLE for more information.
The first two variants add users to a group or remove them from a group. Any role can play the part of groupname or username. The preferred method for accomplishing these tasks is to use GRANT and REVOKE.
To add users to a group:
ALTER GROUP staff ADD USER karl, john;
To remove a user from a group:
ALTER GROUP workers DROP USER beth;
There is no
ALTER GROUP statement in the SQL standard.
Parent topic: SQL Commands