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Database-Management-Systems---10CS54-VTU-notes-->View question

Asked On2018-09-06 03:15:55 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.

Answerd on:2018-09-06 Answerd By:Nikhil-bharadwaj

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