A UNIQUE constraint is the same as a PRIMARY KEY constraint,except that it will accept NULL values.

Name: A UNIQUE constraint is the same as a PRIMARY KEY constraint,except that it will accept NULL values.
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Question

A UNIQUE constraint is the same as a PRIMARY KEY constraint,except that it will accept NULL values.​

Quizplus · Accepted Answer

A UNIQUE constraint ensures that all values in a column are different, except for NULL values which are allowed, whereas a PRIMARY KEY constraint enforces uniqueness and does not allow NULL values.

A UNIQUE Constraint Is the Same as a PRIMARY KEY