Question
Write each of the queries in Datalog. You should use only safe rules, but you may wish to use several IDB predicates corresponding to subexpressions
Write each of the queries in Datalog. You should use only safe rules, but you may wish to use several IDB predicates corresponding to subexpressions of complicated relational-algebra expressions. This must be completed in DATALOG, and use IDB predicates.
Relation Schema:
Product(maker, model, type) PC(model, speed, ram, hd, price) Laptop(model, speed, ram, hd, screen, price) Printer(model, color, type, price) Questions: a) What PC models have a speed of at least 3.00? b) Which manufacturers make laptops with a hard disk of at least 100GB? d) Find the model numbers of all color laser printers.
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