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## Explain multivalued dependency and fourth normal form 4NF with examples. Database Management Systems - 10CS54 VTU notes (JUN/JULY 2013 / JAN 2014/June 2016)

Explain in brief?By:anonymousguy7799

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Amultivalued dependency(MVD) X Y specified on R, where X, and Y are both subsets of R and Z = (R – (X Y)) specifies the following restrictions on r(R) t3[X]=t4[X]=t1[X]=t2[X] t3[Y] = t1[Y] and t4[Y] = t2[Y] t3[Z] = t2[Z] and t4[Z] = t1 [Z]Nikhil-bharadwaj

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multivalued dependency(MVD) X Y specified on R, where X, and Y are both subsets of R and Z = (R – (X Y)) specifies the following restrictions on r(R) t3[X]=t4[X]=t1[X]=t2[X] t3[Y] = t1[Y] and t4[Y] = t2[Y] t3[Z] = t2[Z] and t4[Z] = t1 [Z]Nikhil-bharadwaj

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