Beginner
Database Management Systems
Q2 / 100
What is a primary key?
Correct! Well done.
Incorrect.
The correct answer is B) A column or set of columns uniquely identifying each row in a table, with no NULL values allowed
B
Correct Answer
A column or set of columns uniquely identifying each row in a table, with no NULL values allowed
Explanation
A primary key ensures row uniqueness. It cannot be NULL and must be unique. A table can have only one primary key (though it may span multiple columns — composite key).
Progress
2/100