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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 This is an obsolete command, though still accepted for backwards compatibility, because users and groups are superseded by the more general concept of roles.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.
The third variant changes the name of the group. This is exactly equivalent to renaming the role with ALTER ROLE.
- The name of the group (role) to modify.
- Users (roles) that are to be added to or removed from the group. The users (roles) must already exist.
- The new name of the group (role).
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.