A question from Roger's book.
Which type of key is defined on the child table to implement a referential constraint?
❍ A. Unique key
❍ B. Primary key
❍ C. Foreign key
❍ D. Composite key
I thought the answer is C, but in the book explains as B.
is it correct?
Thanks.
Which type of key is defined on the child table to implement a referential constraint?
❍ A. Unique key
❍ B. Primary key
❍ C. Foreign key
❍ D. Composite key
I thought the answer is C, but in the book explains as B.
is it correct?
Thanks.