SQL

grant all privileges database postgres to user

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

postgresql grant owner to user

ALTER DATABASE name OWNER TO new_owner;

grant all privileges database postgres to user

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

postgresql user permissions to database

sudo -u postgres 
psqlpostgres=# create database mydb;
postgres=# create user myuser with encrypted password 'mypass';
postgres=# grant all privileges on database mydb to myuser;