Pictorial Depiction of Equivalence Rules Rule 5 E1 E2 E2 E1 Rule 6a ☒ E3 E1 E1 E2 E2 E3 68 Rule 7a If 0 only has ☒ attributes from El 60 E2 E1 E2 E1 Database System Concepts-5th Edition,Oct 5,2006. 14.10 @Silberschatz,Korth and SudarshanDatabase System Concepts - 5 14.10 ©Silberschatz, Korth and Sudarshan th Edition, Oct 5, 2006. Pictorial Depiction of Equivalence Rules