1. Databases surround us on the web and everyday life. Now that you have a clearer
idea of what database systems do, find two examples of web sites that you believe
are likely to use databases and discuss what kinds of data they might be storing, as
in the example answer.
A library may keep track of registered users and its books, so that it knows which 
books are in and who has checked out the ones which aren't.
A school system may have a database with a list of all students and data for absences each day.

3. Identify many-to-one relationships. For each of the relationships you diagrammed
above, which ones are many-to-one? Which ones are many-to-many? Indicate
the relationships by writing 1 or 8 at each end of the relationship arrows. If you
are not sure about whether a relationship is one-to-many or many-to-many,
explain why.
course-classroom: many-to-many
course-professor: many-to-many
course-department: many-to-one
classroom-professor: many-to-many
classroom-department:  many-to-many
professor-department: many-to-one

4. Identify entities. Suppose you are creating a database to keep track of a radio
station’s record collection. What are some of the entities your database might
include?
producers, artists, albums, songs, release years


5. Query results and tables look very similar—like a set of tuples. How are query
results and tables different, however?
Tables provide the basic info on which the content of the query is based.  Queries put
the plain-listed information of a table into context.