Database Management
primer-original-v2mediumDatabase ManagementSelect Statementprimer-original-v2

Which statements are true regarding constraints?

Answer options

A
A column with the UNIQUE constraint can contain NULL values.
B
A foreign key cannot contain NULL values.
C
A constraint is enforced only for the INSERT operation.
D
A constraint cannot be disabled when the column contains data.

Correct answer: A column with the UNIQUE constraint can contain NULL values.

Explanation

Quick AnswerThe correct answer is A column with the UNIQUE constraint can contain NULL values. because it directly addresses the core logic of Database Management.

This question has been retained as-is due to its unique context.

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