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Normalization of database model

Normalization of database model. Closure an attribute set. Given a set of attributes ? define the closure of attribute set ? under F (denoted as ? + ) as the set of attributes that are functionally depend on ? under F . Example R(A,B,C,G,H,I) F={A->B,A->C,CG->H,CG->I,B->H}

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