A Comparative Study of Various

نویسنده

  • Wai Yin Mok
چکیده

The normal forms deened in MNE96], OY87a], OY89], RK87] are investigated with respect to generalizing 4NF and BCNF, reducing redundant data values, and design exibility. In addition, we also examine their algorithms and the nested database schemes that they generate. Except in the case that if the given set of MVDs is not connict-free, then the normal form deened in MNE96] is inferior to the other three normal forms in reducing redundant data values, in other cases considered in this paper, the normal form deened in MNE96] is better than or as good as all the other three normal forms. Comparisons of the normal forms deened in OY87a], OY89], RK87] are presented in OY89], RK87] and are not reproduced here. Another contribution of this paper is providing a more general algorithm than the ones we gave in ME96], ME98] for the normal form in MNE96].

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تاریخ انتشار 2007