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] joins aggregate functions interaction 2nd as system drags Cartesian products 2nd column names, qualifying creating 2nd cross joins definition of general guidelines 2nd inner joins overview 2nd multiple table joins 2nd natural joins overview 2nd outer joins overview 2nd types of overview 2nd purpose of 2nd referential integrity, maintaining 2nd self joins overview 2nd views, simplifying with 2nd WHERE clause importance 2nd |