Given following relational schema, write expressions of SQL query. Relational schema of question

Product(model, maker, type)

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

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

Printer(model, color, type, price)

1. List the names and models of the manufacturers who make PCs and laptops with speeds greater than 2.
2. Which manufacturers make PCs, but not printers?
3. List all color printers.
4. List all printers manufacturer, model and price, display the highest price on the top.

Thanks