SQL

postgresql list users

postgres=# du

how to know the username of postgresql

SELECT current_user,
       user,
       session_user,
       current_database(),
       current_catalog,
       version();

postgres list users and roles

SELECT r.rolname, r.rolsuper, r.rolinherit,
  r.rolcreaterole, r.rolcreatedb, r.rolcanlogin,
  r.rolconnlimit, r.rolvaliduntil,
  ARRAY(SELECT b.rolname
        FROM pg_catalog.pg_auth_members m
        JOIN pg_catalog.pg_roles b ON (m.roleid = b.oid)
        WHERE m.member = r.oid) as memberof
, r.rolreplication
, r.rolbypassrls
FROM pg_catalog.pg_roles r
WHERE r.rolname !~ '^pg_'
ORDER BY 1;

postgres list users

SELECT usename AS role_name,
       CASE
           WHEN usesuper AND usecreatedb THEN
               cast('superuser, create database' AS pg_catalog.text)
           WHEN usesuper THEN
               cast('superuser' AS pg_catalog.text)
           WHEN usecreatedb THEN
               cast('create database' AS pg_catalog.text)
           ELSE
               cast('' AS pg_catalog.text)
       END     AS role_attributes
FROM pg_catalog.pg_user
ORDER BY role_name DESC;