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] 10% of rows rule of thumb 1NF (first normal form) 2NF (second normal form) 3NF (third normal form) 2nd data warehousing and 5NF (fifth normal form) |