Homework 04.


To be submitted on paper at the beginning of next lecture, Dec.4.
===============

The subjects are based on the suppliers-parts-projects database. 
You are supposed to write SQL queries that perform the operations below:

1. Retrieve the supplier number, city, and the last name for 
all suppliers (table S). Sort by last name.

2. Return all city names from the table P. Make sure that the
name of each city appears in the output exactly once. Sort the
output in alphabetical order.