Mission 8 / 8
M:N · join × 2 · sum
The last job is to record sales. One customer buys many medicines, and one medicine is bought by many customers. Such a many-to-many link needs a third table in between. No templates here — use what you have learned.
Create the table mijoz: mijoz_id (bigint, primary key, identity), ism (varchar(100), not null), telefon (varchar(20)).