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46. 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:
mn
m+n
(m+n)/2
2(m+n)
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47. The natural join is equal to :
Cartesian Product
Combination of Union and Cartesian product
Combination of selection and Cartesian product
Combination of projection and Cartesian product
48. Which one of the following is not true for a view:
View is derived from other tables.
View is a virtual table.
A view definition is permanently stored as part of the database.
View never contains derived columns.
49. A primary key if combined with a foreign key creates
Parent-Child relationship between the tables that connect them.
Many to many relationship between the tables that connect them.
Network model between the tables that connect them.
None of the above.
50. In E-R Diagram relationship type is represented by
Ellipse
Dashed ellipse
Rectangle
Diamond
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