Which of the following is true about a key?
A) It may be unique.
B) It may be non-unique.
C) In may identify more than one row.
D) Both A and B
E) All of the above

Question

Quizplus · Accepted Answer

A key may be unique, meaning that each row in the table has a unique value for the key column. A key may also be non-unique, meaning that multiple rows in the table can have the same value for the key column. A key may identify more than one row if it is a composite key, which is a key that is made up of two or more columns.

Which of the Following Is True About a Key