Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] n-adic predicate n-ary relation n-ary tuple n-place predicate natural join 2nd network model nonloss decomposition redundancy removal nonscalar normal form normalization goals principles NOT MATCHING null 2nd not a value not in relations not in tuples |