The UNIQUE key constraint and the ____ constraint are very similar.
A) NOT NULL
B) CHECK
C) PRIMARY KEY
D) FOREIGN KEY

Question

Quizplus · Accepted Answer

The UNIQUE key constraint and the PRIMARY KEY constraint are very similar in that they both enforce uniqueness on a column or set of columns. The difference is that a PRIMARY KEY constraint also enforces that the column or set of columns cannot contain NULL values.

The UNIQUE Key Constraint and the ____ Constraint Are Very