# Question: Explain what is meant by repetition of information and inability

Explain what is meant by repetition of information and inability to represent information. Explain why each of these properties may indicate a bad relationaldatabase design.

## Answer to relevant Questions

Suppose that we decompose the schema R = (A, B, C, D, E) into (A, B, C) (A, D, E). Show that this decomposition is a loss less-join decomposition if the following set F of functional dependencies holds: A → BC CD ...Consider the following proposed rule for functional dependencies: If α → β and γ → β, then α → γ. Prove that this rule is not sound by showing a relation r that satisfies ...Consider the algorithm in figure to compute α+. Show that this algorithm is more efficient than the one presented in Figure (Section 7.3.3) and that it computes α+ correctly.Give an example of a relation schema R` and set F` of functional dependencies such that there are at least three distinct lossless-join decompositions of R` into BCNF.For each of the following application areas, explain why a relational database system would be inadequate. List all specific system components that would need to be modified.a. Computer-aided designb. Multimedia databasesPost your question