For each Ex1. Ex2:

Giúpp m vớiii ạhhh. Tks all
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For each Ex1, Ex2:
▪What are all the keys of R?
▪What are all the super-keys for R that are not
candidate keys?
EX1: R (A, B, C, D)
F = {BCD, D→A, A→B}
Ex2: R (A, B, C, D)
F = {AD→B, AB⇒C, BC⇒D, CD⇒A}