Introduction to Relational databases

Introduction to Relational databases The relational database management systems are based on the relational model, the data and the relationships among data are represented by a collection of tables. A row in a table represents a relationship among a set of values.

Example Department Dno Dname Dloc D1 Research Chennai D2 Administration D3 Sales Mumbai Employee Eno Ename Salary Dno E1 Rajan 5000 D1 E2 Raja 6000 E3 Pradeep 8000 D2 E4 Praveen 7000

Select Department where =‘chennai’ Result Project : department over dno,dloc

Join Department and Employee over dno Result