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Wang Ke. Polynomial Tests of Normal Forms and Some Related Results[J]. Journal of Computer Science and Technology, 1992, 7(1): 75-82.
Citation: Wang Ke. Polynomial Tests of Normal Forms and Some Related Results[J]. Journal of Computer Science and Technology, 1992, 7(1): 75-82.

Polynomial Tests of Normal Forms and Some Related Results

  • The following problem is called the everywhere-cover problem:“Given a set of dependencies over a database scheme,is the set of dependencies explicitly given for each relation scheme equivalent to the dependencies implied for that relation scheme?”It is shown that when the everywhere-cover problem has a ‘yes’ answer,examining only the dependencies explicitly given will suffice to test 3NF,BCNF and 4NF of a database scheme.But this does not hold for 2NF.Consequently,in such cases,tests of BCNF and 4NF all tak…
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