Exercise 2.5.1: Express the following constraints about the relations of Exercise 2.3.1, reproduced here:

Product(maker, model, type)

PC(model, speed, ram, hd, price)

Laptop(model, speed, ram, hd, screen, price)

Printer(model, color, type, price)

1) Write the following constraint in SQLite code: A manufacturer of a PC must also make a laptop with at least as great a processor speed.

Please if you can provide some short explanations while writing the query. Much appreciated.