ALTER USER username [ [ WITH ] option [ ... ] ]
where option can be:
[ ENCRYPTED | UNENCRYPTED ] PASSWORD 'password'
| CREATEDB | NOCREATEDB
| CREATEUSER | NOCREATEUSER
| VALID UNTIL 'abstime'
The name of the user whose details are to be altered.
The new password to be used for this account.
These keywords control whether the password is stored encrypted in pg_shadow. (See CREATE USER for more information about this choice.)
These clauses define a user's ability to create databases. If CREATEDB is specified, the user being defined will be allowed to create his own databases. Using NOCREATEDB will deny a user the ability to create databases.
These clauses determine whether a user will be permitted to create new users himself. This option will also make the user a superuser who can override all access restrictions.
The date (and, optionally, the time) at which this user's password is to expire.
ALTER USER is used to change the attributes of a user's PostgreSQL account. Attributes not mentioned in the command retain their previous settings.
Only a database superuser can change privileges and password expiration with this command. Ordinary users can only change their own password.
ALTER USER cannot change a user's group memberships. Use ALTER GROUP to do that.
Use CREATE USER to create a new user and DROP USER to remove a user.
Change a user password:
ALTER USER davide WITH PASSWORD 'hu8jmn3';
Change a user's valid until date:
ALTER USER manuel VALID UNTIL 'Jan 31 2030';
Change a user's valid until date, specifying that his authorization should expire at midday on 4th May 1998 using the time zone which is one hour ahead of UTC:
ALTER USER chris VALID UNTIL 'May 4 12:00:00 1998 +1';
Give a user the ability to create other users and new databases:
ALTER USER miriam CREATEUSER CREATEDB;