ALTER USER
名称
ALTER USER -- 更改一个数据库角色
大纲
ALTER USER role_specification [ WITH ] option [ ... ]
其中 option 可以是:
      SUPERUSER | NOSUPERUSER
    | CREATEDB | NOCREATEDB
    | CREATEROLE | NOCREATEROLE
    | INHERIT | NOINHERIT
    | LOGIN | NOLOGIN
    | REPLICATION | NOREPLICATION
    | BYPASSRLS | NOBYPASSRLS
    | CONNECTION LIMIT connlimit
    | [ ENCRYPTED | UNENCRYPTED ] PASSWORD 'password'
    | VALID UNTIL 'timestamp'
ALTER USER name RENAME TO new_name
ALTER USER role_specification SET configuration_parameter { TO | = } { value | DEFAULT }
ALTER USER role_specification SET configuration_parameter FROM CURRENT
ALTER USER role_specification RESET configuration_parameter
ALTER USER role_specification RESET ALL
其中 role_specification 可以是:
    [ GROUP ] role_name
  | CURRENT_USER
  | SESSION_USER兼容性
   ALTER USER语句是一种
   PostgreSQL扩展。SQL 标准把用户的定义留给
   实现来处理。