Are foreign keys really necessary in a database design?

Question

As far as I know, foreign keys (FK) are used to aid the programmer to manipulate data in the correct way. Suppose a programmer is actually doing this in the right manner alr

Answer 1

You can view foreign keys as a constraint that,

• Help maintain data integrity
• Show how data is related to each other (which can help in enforcing business logic and rules)
• If used correctly, can help increase the efficiency with which the data is fetched from the tables.