Pictorial Depiction of Equivalence Rules Rule 5 E1 E2 E2 Rule 6.a ◇外 Er E E2 E2 E3 60 Rule 7.a 凶 If 0 only has attributes from E 60 E2 Er E2 Database System Concepts-7th Edition 16.11 @Silberschatz,Korth and SudarshanDatabase System Concepts - 7 16.11 ©Silberschatz, Korth and Sudarshan th Edition Pictorial Depiction of Equivalence Rules