如何查看postgresql数据库用户?

                                                                               如何查看postgresql数据库用户

postgres=# \du

                             List of roles
 Role name |                   Attributes                   | Member of 
-----------+------------------------------------------------+-----------
 mqis      | Password valid until infinity                  | {}
 mqis_app  | Password valid until infinity                  | {}
 postgres  | Superuser, Create role, Create DB, Replication | {}


postgres=# SELECT u.usename AS "User name",
  u.usesysid AS "User ID",
  CASE WHEN u.usesuper AND u.usecreatedb THEN CAST('superuser, create
database' AS pg_catalog.text)
       WHEN u.usesuper THEN CAST('superuser' AS pg_catalog.text)
       WHEN u.usecreatedb THEN CAST('create database' AS
pg_catalog.text)
       ELSE CAST('' AS pg_catalog.text)
  END AS "Attributes"
FROM pg_catalog.pg_user u

ORDER BY 1;

-------------------------------------------------

 User name | User ID |    Attributes     
-----------+---------+-------------------
 mqis      |   16393 | 
 mqis_app  |   16397 | 
 postgres  |      10 | superuser, create+
           |         | database
(3 rows)


postgres=#