CompTIA ITF+ (FC0-U61) — Question 16

Which of the following relational database constructs is used to ensure valid values are entered for a column?

Answer options

• A. Schema
• B. Permissions
• C. Constraint
• D. Column

Correct answer: C

Explanation

A Constraint is a database rule that restricts the types of values that can be entered into a column, ensuring data integrity. The other options do not enforce value validity; for instance, a Schema defines the structure of the database, Permissions control access rights, and Column simply refers to a field in a table.