what is a user role postgres code example

Example 1: how to add user to role postgresql

CREATE ROLE joe LOGIN INHERIT;
CREATE ROLE admin NOINHERIT;
CREATE ROLE wheel NOINHERIT;
GRANT admin TO joe;
GRANT wheel TO admin;

Example 2: how to add user to role postgresql

GRANT group_role TO role1, ... ;
REVOKE group_role FROM role1, ... ;

Example 3: postgresql create user roles

CREATE ROLE admin WITH CREATEDB CREATEROLE;