I need mysql admin_user (not root user) which can create write_user with permissions: CREATE, UPDATE, INSERT, DELETE and SELECT.
admin_user and write_user have access to main_db.
write_user will create user_db and only he can access to that db.
If I want that admin_user can create new user with some permissions, admin_user has to be created "WITH GRANT OPTION" but then he has access to all databases.
Question: How to create mysql user with CREATE USER grant but without access to new databases?