Assignment 1

Assignment 1

Product (maker, model, type)PC (model, speed, ram, hd, rd, price)Laptop (model, speed, ram, hd, screen, price)Printer (model, color, type, price)a. Find the model number, speed, and hard-disk size for all PCs whose price is under $1200.

SELECT model, speed, hdFROM PCWHERE pricem2.length AND m2.title=Gone with the Windd. Which executives are worth more than Merv Griffin?

SELECT e1.name

FROM MovieExec e1, MovieExec e2

WHERE e2.name="Merv Griffin"

AND e1.netWorth > e2.netWorth

Assignment 3

a. Give the manufacturer and speed of laptops with a hard disk of at least thirty megabytes.

SELECT maker, speedFROM Product NATURAL JOIN LaptopWHERE hd>=30b. Find those manufacturers who sell laptops, but not PCs.

SELECT maker

FROM Product

WHERE type="Laptop"

AND maker NOT IN

(SELECT maker from Product

WHERE type="PC")

c. Find those pairs of PC models that have both the same speed and RAM.

SELECT p1.model, p2.model

FROM PC p1, PC p2

WHERE p1.speed=p2.speed AND p1.ram=p2.ram

AND p1.model>p2.modelAssignment 4Use subqueries for each query.

a. Find the makers of PCs with a speed of at least 1200.

SELECT maker FROM productWHERE model IN (SELECT model FROM PC WHERE speed>=1200)b. Find the printers with the highest price.

Select model from Printer where price >= ALL (Select price from printer)

c. Find the laptops whose speed is slower than that of any PC.

Select model from Laptop where speed