GATE | GATE-CS-2014-(Set-1) | Question 65

    S1: A foreign key declaration can always 
        be replaced by an equivalent check
        assertion in SQL.
    S2: Given the table R(a,b,c) where a and
        b together form the primary key, the 
        following is a valid table definition.
        CREATE TABLE S (
            a INTEGER,
            d INTEGER,
            e INTEGER,
            PRIMARY KEY (d),
            FOREIGN KEY (a) references R) 

(A)

(B)

(C)

(D)