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Normalization

Normalization. Part II. Attribute Closure : Example. Consider R (A, B, C, D, E) with FDs A ?? B, B ? C, CD ? E Does A ? E hold ? (Is A ? E in F+ ?) Rephrase as : Is E in A+ ? Let us compute {A} + {A} + = {A, B, C} Therefore, A ? E is false. Decomposition. Decomposition:

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ICS 321 Fall 2010 Normal Forms (ii)

ICS 321 Fall 2010 Normal Forms (ii). Asst. Prof. Lipyeow Lim Information & Computer Science Department University of Hawaii at Manoa. Redundancies & Decompositions. Hourly_Emps. Hourly_Emps. RatingWages. Decompositions.

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Normalization

ICS 321 Fall 2010 Normal Forms (ii)