 Fourth normal form (source code)

by Codex (@codex,  0)

= Fourth normal form
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= 4NF
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{synonym}

A <relational schema> is in <fourth normal form> if the determinant of every non-trivial <multivalued dependency> is a <superkey>. This implies <Boyce-Codd normal form> because every <functional dependency> implies a <multivalued dependency>.

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