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ALTER USER name [ [ WITH ] option [ ... ] ]
这里option可以是：
SUPERUSER | NOSUPERUSER
| CREATEDB | NOCREATEDB
| CREATEROLE | NOCREATEROLE
| CREATEUSER | NOCREATEUSER
| INHERIT | NOINHERIT
| LOGIN | NOLOGIN
| CONNECTION LIMIT connlimit
| [ ENCRYPTED | UNENCRYPTED ] PASSWORD 'password'
| VALID UNTIL 'timestamp'
ALTER USER name RENAME TO new_name
ALTER USER name SET configuration_parameter { TO | = } { value | DEFAULT }
ALTER USER name SET configuration_parameter FROM CURRENT
ALTER USER name RESET configuration_parameter
ALTER USER name RESET ALL
ALTER USER现在是ALTER ROLE的别名，
ALTER USER语句是PostgreSQL扩展。 SQL标准将用户的定义交给实现完成。