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APPLY LATEST GOVT JOBS

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201 A primary key is combined with a foreign key creates
(A). Parent-Child relation ship between the tables that connect them.
(B). Many to many relationship between the tables that connect them.
(C). Network model between the tables that connect them.
(D). None of the above.


202 In E-R Diagram derived attribute are represented by 12
(A). Ellipse
(B). Dashed ellipse
(C). Rectangle
(D). Triangle Ans B 203 Cross Product is a:
(A). Unary Operator
(B). Ternary Operator
(C). Binary Operator
(D). Not an operator


204 An instance of relational schema R (A, B, C) has distinct values of A including NULL values. Which one of the following is true?
(A). A is a candidate key
(B). A is not a candidate key
(C). A is a primary Key
(D). Both
(A). and
(C).


205 Consider the join of a relation R with relation S. If R has m tuples and S has n tuples, then the maximum size of join is:
(A). mn
(B). m+n
(C). (m+n)/2
(D). 2(m+n)