Computers and Technology, 30.08.2019 22:10 Gabby1128

Consider the relation r(a, b,c, d) with fds ab -> c, c-> d, d-> a. what is the 3nf status of r? 1. ris in 3nf. 2. ris not in 3nf. it must be deconstructed into r1(a, b,c) with ab-> c and r2(a, b,d) with d-> a. s. r is not in 3nf. it must be deconstructed into r1(a, b,c) with ab-> c, r2(a, b,d) with d-> a and r3(a, b,d) 4. ris not in 3nf but there is no unique deconstruction.

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Consider the relation r(a, b,c, d) with fds ab -> c, c-> d, d-> a. what is the 3nf status...