Monday, 20 November 2017

GATE 01

GATE 2013

R (ABCDEFGH)
CH → G
A → BC
B → CFH
E → A
F → EG

Find the number of candidate keys?

Sol. Which one is not at right side.
That is D.
so,
[D]+ →  D
Its not candidate key., because not all keys determined in it.
[DA]+ →  DABCFHEG
Its candidate key because all keys are determined in it.
[DB]+ →  ABCFHEGA
Its candidate key because all keys are determined in it.
[DC]+ →  DC
Its not candidate key., because not all keys determined in it.
[DE]+ →  DEABCFHG
Its candidate key because all keys are determined in it.
[DF]+ → DFEGABCH   
Its candidate key because all keys are determined in it.
[DCH]+ →  DCHG
Its not candidate key., because not all keys determined in it.

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