Primary key - Database

Q.  Database: Which of the following fields in a student file can be used as a primary key?
- Published on 29 Jun 15

a. class
b. Social Security Number
c. GPA
d. Major

ANSWER: Social Security Number
 
The primary key is a unique identifier and it is unique for each record. Here the social security number is unique as each student is identified by that and there will be no duplications.

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