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Lot implies ssn lot - PowerPoint PPT Presentation

LECTURE 5: Schema Refinement and Normal Forms

LECTURE 5: Schema Refinement and Normal Forms. SOME OF THESE SLIDES ARE BASED ON YOUR TEXT BOOK. Anomalies Insertion anomalies Cannot record filmType without starName Deletion anomalies If we delete the last star, we also lose the movie info. Modification (update) anomalies. DECOMPOSITION.

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ICS 321 Fall 2009 Schema Refinement & Normal Forms

ICS 321 Fall 2009 Schema Refinement & Normal Forms. Asst. Prof. Lipyeow Lim Information & Computer Science Department University of Hawaii at Manoa. The Problem with Redundancy. Hourly_Emps. Suppose hourly wages are determined by rating Redundant storage : (8,10) stored multiple times

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Lot implies ssn lot - PowerPoint PPT Presentation

LECTURE 5: Schema Refinement and Normal Forms

ICS 321 Fall 2009 Schema Refinement &amp; Normal Forms

ICS 321 Fall 2009 Schema Refinement & Normal Forms