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] unary relation unary tuple UNGROUP union 2nd UNION union disjoint set-theoretic 2nd UNIQUE (quantifier) uniqueness (key) universal quantifier UPDATE expansion via cursor (SQL) update anomalies update versus UPDATE "updating attributes" "updating tuples" user-defined type 2nd 3rd |