create user in postgres - basic syntax

I will create

a group role called common_users

a user called ro_user1

in a database called db01

The read-only user ro_user1 should be able perform queries against all tables owned by the schema schema1.

First, create the role common_users by logging onto the postgres (default) database

psql

CREATE ROLE common_users WITH
  NOLOGIN
  NOSUPERUSER
  INHERIT
  NOCREATEDB
  NOCREATEROLE
  NOREPLICATION
  NOBYPASSRLS;

GRANT pg_read_all_stats TO common_users;

Then, create the user ro_user1:

create user ro_user1 password 'mysecretpassword';
grant common_users to ro_user1;
grant connect on database db01 to ro_user1;

Log into the database db01 and revoke and grant some privileges:

psql
\connect db01
revoke all on schema schema1 from ro_user1;
grant usage on schema schema1 to ro_user1;
grant select on all tables in schema schema1 to ro_user1;

Confirm the privileges:

\connect postgres
select database_privs('ro_user1');