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3nf decomposition algorithm - PowerPoint PPT Presentation

ICS 321 Fall 2011 Normal Forms (ii)

ICS 321 Fall 2011 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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Algorithm : Decomposition into 3NF

Algorithm : Decomposition into 3NF. Obviously, the algorithm for lossless join decomp into BCNF can be used to obtain a lossless join decomp into 3NF (typically, can stop earlier). But how to ensure dependency preservation? Idea 1: If X Y is not preserved, add relation XY.

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3nf decomposition algorithm - PowerPoint PPT Presentation

ICS 321 Fall 2011 Normal Forms (ii)

Algorithm : Decomposition into 3NF