1.

Select all statements that correctly describe a reason why data modeling is important.

a.

A good data model only describes the lower layers in the database.

b.

Application programmers usually need a data model to help build the applications that use the database.

c.

A data model provides a blueprint or abstraction by which the database can be constructed.

d.

A good data model only describes the highest layers in the database.

e.

A data model is a communication tool which can facilitate interaction between those who create and maintain the database and the end users.

2.

From the statements below, select all that correctly describe a type of database.

	a.	A distributed database has data which is spread across different sites.
	b.	A data warehouse is primarily used to support a company's day-to-day operations such as sales.
	c.	An enterprise database is a database that is used by many users (more than fifty, usually hundreds) across many departments.
	d.	A workgroup database is typically used by fifty or fewer people who work together, usually in a department.