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3 years ago

Given the following schema

Computers and Technology

1 answer:

vampirchik [111]3 years ago

8 0

Answer:

A ⟶ BCD , B ⟶ E , E ⟶ F , G⟶ H , H ⟶ E

b) AG

c) attached below

d ) attached below

Explanation:

<u>a) Minimal cover of this schema </u>

This can be written following the steps below

step 1 : AB ⟶ C, AB ⟶ D , A ⟶ B , B ⟶ E, E ⟶ F , A⟶F, G ⟶ H, H ⟶ E, GC⟶H, G ⟶ E

removing redundant FD

AB ⟶ C , AB ⟶ D , A ⟶ B, B ⟶ E, E ⟶ F, G ⟶H , H⟶ E ,

eliminating p if Q⁺ contains p

Finally the Minimal cover of the schema

A ⟶ BCD , B ⟶ E , E ⟶ F , G⟶ H , H ⟶ E

<u>B) Key of this schema </u>

AG is the key of this schema given that ( AG )⁺ = ABCDEFGH

C) Determine the 3rd normal form decomposition

attached below

D) BCNF decomposition

attached below

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