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Computer Science Set-1
Databases
60

Databases MCQ with Answers

60) The result of the UNION operation between R1 and R2 is a relation that includes

All the tuples of R1

All the tuples of R2

All the tuples of R1 and R2

All the tuples of R1 and R2 which have common columns

Answer is:

All the tuples of R1 and R2

Databases MCQ with Answers

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Related Databases MCQ with Answers

62) Which of the operations constitute a basic set of operations for manipulating relational data?

Predicate calculus

Relational calculus

Relational algebra

None of the above

Answer is:

Relational algebra

63) Which of the following is another name for weak entity

Child

Owner

Dominant

All of the above

Answer is:

Child

64) Which of the following database object does not physically exist

Base table

Index

View

None of the above

Answer is:

View

65) NULL is

The same as 0 for integer

The same as blank for character

The same as 0 for integer and blank for character

Not a value

Answer is:

Not a value

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