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] Pascal, Fabian performance not a model issue versus constraint physical design physical representation hidden 2nd physical storage not in relational model pointers not in relational model 2nd possible representation POSSREP "possrep" predicate 2nd compound dyadic monadic n-adic n-place simple versus constraint primary key primitive operators Principle of Identity of Indiscernibles, The Principle of Interchangeability, The Principle of Orthogonal Design, The procedural procedure (SQL) product 2nd 3rd project 2nd proper subset 2nd proper superset 2nd proposition 2nd compound simple versus constraint versus predicate |