The unnormalized relation and the generalized semantic model were mathematically formulated and a new conception of function dependency on the object set defined. The schema construction problem of unnormalized relation in which information duplication is minimum was solved using the new conception. Algorithm to obtain the target unnormalized relation schema is as follows. First, the universe of discourse is modelled using the GSM so as to transform it into a reasonable and wen-organized model whichrepresents the same information. Second, the unnormalized relation schema is constructed according methods 1-6.
展开▼
