True or false about databases

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   Redundancy can lead to data inconsistency.

2. Statement is true

   Yes

   Statement

   A schema can have many instances over time.

3. Statement is true

   No

   Statement

   Degree counts the tuples in a relation.

4. Statement is true

   Yes

   Statement

   A foreign key may sometimes take a NULL value.

5. Statement is true

   No

   Statement

   A data value in an attribute may be divisible.

Instructions

Decide whether each statement is true or false.

Explanation