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41. A file manipulation command that extracts some of the records from a file is called
SELECT
PROJECT
JOIN
PRODUCT
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42. A primary key is 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
43. In E-R Diagram derived attribute are represented by
Ellipse
Dashed ellipse
Rectangle
Triangle
44. Cross Product is a:
Unary Operator
Ternary Operator
Binary Operator
Not an operator
45. 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 is a candidate key
A is not a candidate key
A is a primary Key
Both (A) and (C)
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