Create role:
create role
create user
CREATE USER name WITH Role XXX
List users and roles:
\du
\du+
SELECT rolname FROM pg_roles;
SELECT * FROM pg_roles;
Assign roles:
GRANT "your-defined role" TO "your username";
CREATE ROLE
GRANT
Superuser
rds_superuser
CREATE USER
\du, \du+
create user, Alter user
\list+, \du+
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