A functional dependency from "A" to "B" is said to be trivial if "B" is a subset of "A". Example In the corresponding relation, Tuple A Ct1 a1 c1 t2 a1 c1 t3 a2 c2 t3 a2 c2 t4 a3 c3 t5 a3 c2A → C holds ast1[A] = t2[A] then t1[C] = t2[C] t3[A] = t3[A]...
1.It is a fundamental work to find out a F_(min) of a given functional dependency set while normalizing a relational pattern.构造了一个求解最小函数依赖集Fmin的计算机算法。 6)function dependence diagram函数依赖图 1.This paper brings forward a method of graphical standardization of relation schema...
A functional dependency is trivial if Y is a subset of X. In a table with the attributes of employee name and Social Security number (SSN), employee name is functionally dependent on SSN because the SSN is unique for individual names. An SSN identifies the employee specifically, but an empl...