If A1 A2 A3 Are Attributes In A Relation And S Is Another #577
If a1, a2, a3 are attributes in a relation and S is another relation, which of the following is an incorrect specification of an integrity constraint?
This multiple choice question (MCQ) is related to the book/course
gs gs114 Relational Database Management System.
It can also be found in
gs gs114 Introduction to Relational Model and SQL - Sql Data Definition - Quiz No.1.
If a1, a2, a3 are attributes in a relation and S is another relation, which of the following is an incorrect specification of an integrity constraint?
primary key(a1, a2, a3)
primary key(a1)
foreign key(a1, a2) references S
foreign key(a1, a2)
