1.

Select all that are true of object-oriented data models. (Check all that are true.)

a.

Object-oriented data models are typically depicted using entity-relationship class diagrams.

b.

In object-oriented data models, both data and their relationships are contained in a single structure known as an object.

c.

Object-oriented models are based on objects that share similar characteristics grouped in classes.

d.

In an object-oriented data model, an object can represent any physical or abstract thing.

2.

Which of the following correctly describe the relationships between data in different tables? (Check all that are true.)

a.

Data that is related in the real world, such as baseball players and the teams that they play for, may be represented as related data in different tables.

b.

A well-designed operational database will typically store the same information in several different tables.

c.

Each column in a table usually represents a different entity in the real world.

d.

A table can be related to at most one other table.

3.

Select the alternative that correctly identifies the relationship classification described by the two business rules below.

Each student takes one or more classes.

Each class may be taken by one or more students.

	a.	0:1 (zero to one)
	b.	1:5 (one to five)
	c.	M:N (many to many)
	d.	1:1 (one to one)
	e.	1:M (one to many)