Question

4, Mohrdar lan. Ia A, B, and C be Robmodules of an R-module
M such that AB. Show that
an (B+C)-Bruno).
Geve an example of three R-submodules 1,B,C of an R-module
M such that
An (B+C)* UnB) + unc).

Answer 1

Answer:

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Consider the relation scheme R(A,B,C) with the following functional dependencies:

A,B→C,

C→A

Show that the scheme R is in 3NF but not in BCNF.

Determine the minimal keys of relation R.