[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] N values recipe nodes, hierarchies children locating immediate leaf nodes listing 2nd listing parent nonaggregated columns recipe nonrecurring events, excluding, recipe normalized data attributes dependent columns and folding tables and GroupPermissions table memory requirements readability repeating columns and NOT EXISTS statement, differences and NULL values |