Relational Algebra A procedural language consisting of a set of operations that take one or two relations as input and produce a new relation as their result ■Six basic operators ·select:o project:Π 。union:U ·set difference:- 。 Cartesian product:x 。rename:p Database System Concepts-7th Edition 2.11 ©Silberscha乜，Korth and SudarshanDatabase System Concepts - 7 2.11 ©Silberschatz, Korth and Sudarshan th Edition Relational Algebra ▪ A procedural language consisting of a set of operations that take one or two relations as input and produce a new relation as their result. ▪ Six basic operators • select:  • project:  • union:  • set difference: – • Cartesian product: x • rename: 