Question

3. The relation employee(ID, name,street, Credit, street,city,salary) is decomposed into
employeel (ID, name)
employee2 (name, street, city, salary)
This type of decomposition is called
a) Lossless decomposition
b) Lossless-join decomposition
c) All of the mentioned
d) None of the mentioned​

Answer 1

Answer:

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Answer 2

The relation employee(ID, name,street, Credit, street,city,salary) is decomposed into employeel (ID, name) employee2 (name, street, city, salary) This type of decomposition is called

a) Lossless decomposition

b) Lossless-join decomposition

c) All of the mentioned

d) None of the mentioned​

The correct answer is :

d) None of the mentioned​

Explanation :

None of the given options is correct.

In Lossless decomposition, the normal feature is selected. Common attribute must be candidate key or super key in any relation r1 r2 or both in order to select common attribute.

In the Lossless-join decomposition r1 r2 is a decomposition of the relation r. If a natural join of the relation r1 and r2 is performed, it returns the original relation R. In this way flawless join decomposition can remove the database redundancy while preserving the original data.

#SPJ3

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