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] value can't be updated nonscalar scalar versus variable VAR base relvar scalar snapshot tuple view variable can be updated nonscalar scalar tuple versus value view 2nd retrieval two different purposes updating versus base relvar |