Explain Fifth Normal Form Database Management Systems 10CS54 VTU notes JUNJULY 2013June 2016

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Explain Fifth Normal Form Database Management Systems - 10CS54 VTU notes (JUN/JULY 2013/June 2016)

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By:anonymousguy7799

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A join dependency (JD), denoted by JD{R1, R2, …, Rn}, specified on relation schema R, specifies a constraint on the states r of R. The constraint states that every legal state r of R should have a lossless join decomposition into R1, R2, …, Rn; that is, for every such r we have * (πR1(r), (πR2(r), … (πRn(r)) = r
Lossless-join property refers to when we decompose a relation into two relations - we can rejoin the resulting relations to produce the original relation. However, sometimes there is the requirement to decompose a relation into more than two relations. Although rare, these cases are managed by join dependency and 5NF. 

Nikhil-bharadwaj

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