Database Systems Chapter 3

The practical significance of taking the logical view of a database is that it serves as a reminder of the simple file concept of data storage.

• True

• False

You can think of a table as a persistent representation of a logical relation.

• True

• False

The order of the rows and columns is important to the DBMS.

• True

• False

Character data can contain any character or symbol intended for mathematical manipulation.

• True

• False

Each table in a relational database must have a primary key.

• True

• False

The flow's range of permissible values is known as its domain.

• True

• False

The idea of determination is unique to the database environment.

• True

• False

Only a single attribute, not multiple attributes, can define functional dependence.

• True

• False

If the attribute (B) is functionally dependent on a composite key (A) but not on any subset of that composite key, the attribute (B) is fully functionally dependent on (A).

• True

• False

A null is created when you press the Enter key or the Tab key to move to the next entry without making a prior entry of any kind.

• True

• False