Chapter 15:Query Processing Overview Measures of Query Cost ■Selection Operation ■ Sorting ■Join Operation ■Other Operations Evaluation of Expressions Database System Concepts-7th Edition 15.2 @Silberschatz,Korth and SudarshanDatabase System Concepts - 7 15.2 ©Silberschatz, Korth and Sudarshan th Edition Chapter 15: Query Processing ▪ Overview ▪ Measures of Query Cost ▪ Selection Operation ▪ Sorting ▪ Join Operation ▪ Other Operations ▪ Evaluation of Expressions