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3
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1answer
136 views

How can I prove / disprove If A ↠ BC and A → B then A → C

/ From GATE 2007 IT: Consider the following implications relating to functional and multi valued dependencies given below, which may or may not be correct. A) If A ↠ B and A ↠ C then A → BC B) ...
2
votes
2answers
66 views

Dependency preserving decomposition

Let be the following relational scheme: F={AB → C; AC → B; AD → E; B → D; BC → A;E → G} Is the following decomposition without loss of dependency? R¹=(A,B),R²=(B,C),R³=(A,B,D,E),R⁴...
1
vote
1answer
64 views

Apply Definition of MVD (multivalued dependency) to Example?

Supposedly this multivalued dependency (MVD) and this functional dependency (FD): {W} ↠ {N,D} and {W} → {N} hold in this table: V W N D ================= | v | w | n | 1 | -------------...