Beginner
SQL
Q8 / 100
What is the purpose of a PRIMARY KEY constraint?
Correct! Well done.
Incorrect.
The correct answer is B) To uniquely identify each row in a table and disallow NULL values
B
Correct Answer
To uniquely identify each row in a table and disallow NULL values
Explanation
A PRIMARY KEY uniquely identifies each record in a table; it must contain unique values and cannot contain NULLs.
Progress
8/100