see user privileges postgres code example

Example 1: grant all privileges database postgres to user

GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA schema_name TO username;

Example 2: list all permissions on a table in postgres

SELECT grantee, privilege_type 
FROM information_schema.role_table_grants 
WHERE table_name='mytable'

Example 3: grant all privileges database postgres to user

GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA schema_name TO username;