데이터베이스 관계 대수 예제입니다. 다음의 교재를 참고했음을 미리 밝힙니다. p.49 Exercise 4.1 Exercise 4.1 : This exercise builds upon the products schema of Exercise 3.1. Recall that the database schema consists of four relations, whose schemas are: Product(maker, model, type) PC(model, speed, ram, hd, price) Laptop(model, speed, ram, hd, screen, price) Printer(model, color, type, price) Some sample data for the relation Produ..