Set-Intersection Operation Notation:r∩s Defined as: ros={tlt∈rand t∈s} Assume: r,s have the same arity attributes of r and s are compatible Note:r∩s=r-(r-s) Database System Concepts-6th Edition 6.8 @Silberschatz,Korth and SudarshanDatabase System Concepts - 6 6.8 ©Silberschatz, Korth and Sudarshan th Edition Set-Intersection Operation Notation: r  s Defined as: r  s = { t | t  r and t  s } Assume: r, s have the same arity attributes of r and s are compatible Note: r  s = r – (r – s)