NIELIT 2016 DEC Scientist B (CS) - Section B: 47

Question

If every functional dependency in set $E$ is also in closure of $F$ then this is classified as

• A. $FD$ is covered by $E$
• B. $E$ is covered by $F$
• C. $F$ is covered by $E$
• D. $F$ plus is covered by $E$

Comments

Shouldn’t it be C ??

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No, coz F might have some extra FD's.

Answer 1

If every functional dependency in set E is also in closure of F means $F^{*}\subseteq E^{*}$

E cover F if every FD in F can be referred from E.

E cover F if $ F^{*}\subseteq E^{*}$(* is clouser)

so ans should be B  E is covered by F

 

 

Answer 2

ans : B

If every functional dependency in set E is also in closure of F Then it means that 

 E is covered by F