Set intersection of two relations Relation r,s: AB AB X 1 C 2 2 B 3 B 1 S r rS AB 2 Note:r∩s=r-(r-s) Database System Concepts-6th Edition 2.13 ©Silberschat乜，Korth and SudarshanDatabase System Concepts - 6 2.13 ©Silberschatz, Korth and Sudarshan th Edition Set intersection of two relations Relation r, s: r  s Note: r  s = r – (r – s)