Question

A, B, C, E, F are atomic attributes. F = {? A ? B; ? B ? C; ? A, B ? E; ? A, E ? F; ? A, F ? E } 1) Explain when a fd f ? F is redundant? 2) Explain how to remove a fd in general. 3) Proof that fd ? A, F ? E ist redundant. 4) Apply the approach-by-synthesis to design a 3NF relational schema.

          A, B, C, E, F are atomic attributes.
F = {? A ? B;
? B ? C;
? A, B ? E;
? A, E ? F;
? A, F ? E
}
1) Explain when a fd f ? F is redundant?
2) Explain how to remove a fd in general.
3) Proof that fd ? A, F ? E ist redundant.
4) Apply the approach-by-synthesis to design a 3NF relational schema.

A, B, C, E, F are atomic attributes.
F = ? A ? B;
? B ? C;
? A, B ? E;
? A, E ? F;
? A, F ? E

1) Explain when a fd f ? F is redundant?
2) Explain how to remove a fd in general.
3) Proof that fd ? A, F ? E ist redundant.
4) Apply the approach-by-synthesis to design a 3NF relational schema.

Added by Jimmy J.

Computer Science and Information Technology

Trishna Knowledge Systems 2018 Edition

Instant Answer

Solved by Expert Akash M

11/13/2023

Step 1

In other words, if the FD can be derived from the closure of the other FDs in the set, then it is redundant. Show more…

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A, B, C, E, F are atomic attributes. (1) A->B; (2) B->C; (3) A,B->E; (4) A,E->F; (5) A,F->E } Explain when a fd finF is redundant? Explain how to remove a fd in general. Proof that fd (5) A,F->E ist redundant. Apply the approach-by-synthesis to design a 3NF relational schema. A, B, C, E, F are atomic attributes. F={OA>B; @B>C; OA,B>E; AE>F; AF>E 1) Explain when a fd f e F is redundant? 2) Explain how to remove a fd in general. 3) Proof that fd A, F > E ist redundant. 4) Apply the approach-by-synthesis to design a 3NF relational schema.