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Journals ACM SIGCSE Bulletin Volume 24 Issue 1

Many practitioners and academicians believe that data violating fourth normal form is rarely encountered. We report upon a study of forty organizational databases; nine of them contained data violating fourth normal form. Consequently, the need to understand and user fourth normal form is more important than previously believed.

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The practical need for fourth normal form

Wu, Margaret S.
ACM SIGCSE Bulletin , Volume 24 (1)
Association for Computing Machinery – Mar 1, 1992

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