Chapter 2:Relational Model Structure of Relational Databases Fundamental Relational-Algebra-Operations Additional Relational-Algebra-Operations Extended Relational-Algebra-Operations Null Values Modification of the Database Database System Concepts-5th Edition,Oct 5,2006 2.2 @Silberschatz,Korth and SudarshanDatabase System Concepts - 5 2.2 ©Silberschatz, Korth and Sudarshan th Edition, Oct 5, 2006 Chapter 2: Relational Model Structure of Relational Databases Fundamental Relational-Algebra-Operations Additional Relational-Algebra-Operations Extended Relational-Algebra-Operations Null Values Modification of the Database