SQL Language Guide : 8. SQL Statements : ALTER USER : ALTER USER Examples
 
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ALTER USER Examples
The following examples change the characteristics of an existing user:
1. Change an existing user, specifying privileges and group.
ALTER USER bspring WITH
   GROUP = engineering,
   NOPRIVILEGES;
2. Change an existing user, specifying privileges and group.
ALTER USER barney WITH
   GROUP = marketing,
   PRIVILEGES = (CREATEDB,TRACE,SECURITY);
3. Specify no expiration date for a predefined user.
ALTER USER bspring WITH NOEXPIRE_DATE
4. Allow a user with maintain_users privilege to change or remove any password.
ALTER USER username
   WITH PASSWORD='theirpassword'
5. Grant createdb privilege to user bspring.
ALTER USER bspring ADD PRIVILEGES (CREATEDB)
6. Specify a profile for a particular user
ALTER USER bspring WITH PROFILE = dbop
where "dbop" is an existing profile.
7. Specify that a user has an externally verified password.
ALTER USER bspring WITH EXTERNAL_PASSWORD
8. Specify that user roy has the privilege to change his password.
ALTER USER roy WITH PRIVILEGES = (CHANGE_PASSWORD)
9. Roy changes his own password.
ALTER USER roy WITH
   OLDPASSWORD='myoldpassword',
   PASSWORD='mypassword';