a) Minimum number of tables required for the relation R to be in 1NF .
b) Minimum number of tables required for the relation R to be in 3NF .
c) Minimum number of tables required for the relation R to be in 4NF.
a) Here as we are just interested in 1NF, in E1 we can have combined PK as AED. Now, we can combine E3 and E1 (Suppose it is R1) with new PK(Primary key) AEDB. We keep E2 as separate table with PK as C.
So according to me, we need 2 tables R1(A,E,D,B) with AEDB as combined PK and E2(C) with C as PK for the relation R to be in 1NF
b) I think the above split would also satisfy 3NF.
c) For 4NF, we need to put the multi-valued attributes E and D of E1 in separate table. So for 4NF the tables would be
R1(AB) with AB as combined Pk, R2(AE) with AE as combined PK, R3(AD) with AD as combined PK, R4(C) with C as PK.
So for 4NF, we would require 4 tables according to me.
I am not so sure about the answers for a) and b). Can someone please point out the mistakes if any?
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