81) A table joined with itself is called

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 ?

84) Which structure is the hierarchical model based

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