Which of the following can be defined as a column (or collection of columns) A such that all other columns are functionally dependent on A and no subcollection of the columns in A has this property?
A) functional key
B) composite key
C) primary key
D) declared key

Question

Quizplus · Accepted Answer

A primary key is a unique identifier for each record in a database table, and all other columns in the table are functionally dependent on it. It cannot be decomposed into a smaller subset of columns that the entire table is dependent on, which matches the definition given.

Which of the Following Can Be Defined as a Column