Chapter 3: Relational Model Structure of Relational Databases Relational Algebra Extended Relational-Algebra-Operations Modification of the database Views Tuple Relational calculus Domain relational calculus 标 Database System Concepts 3.1 OSilberschatz, Korth and SudarshanDatabase System Concepts 3.1 ©Silberschatz, Korth and Sudarshan Chapter 3: Relational Model Structure of Relational Databases Relational Algebra Extended Relational-Algebra-Operations Modification of the Database Views Tuple Relational Calculus Domain Relational Calculus