83) The following functional dependencies hold for relation R(A, B, C) and S(B, D, E) B —> A, A —> C , the relation R contains 200 tuples and relation S contains 100 tuples. What is maximum number of tuples possibles in natural join R and S ?

85) In the relational model, the number of attributes and number of tuples in a relation are termed as __________and ______________respectively

86) In domain relational calculus we create a variable for every

87) Why do we have to create a primary index on a primary key

88) In context with relational Algebra. Which of the following are unary operators.1.Select2. Project3. Union4. Product