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Computer Science Set-1
Databases
22

Databases MCQ with Answers

22) Manager's salary details are hidden from the employee. This is

conceptual level data hiding

physical level data hiding

external level data hiding

none of these

Answer is:

conceptual level data hiding

Databases MCQ with Answers

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Related Databases MCQ with Answers

24) Which of the following contains a complete record of all activity that affected the contents of a database during a certain period off time

Report writer

Query language

Data manipulation language

Transaction log

Answer is:

Transaction log

25) Updating a data base means

revising the file structure

reorganizing the database

modifying or adding record occurrences

All of these

Answer is:

revising the file structure

26) Which of the following contains complete record of all activity that affected the contents of a database during a certain period of time

4-GL

d-BASE

Oracle

SQL

Answer is:

d-BASE

27) In tuple relational calculus P1 → P2 is equivalent to

¬ P1 ∨ P2

P1 ∨ P2

P1 ∧ P2

P1 ∧ ¬P2

Answer is:

¬ P1 ∨ P2

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