network extensions in their established products such as IMS and DL/I. Secondly, it waseventually displaced by the relational model, which offered a higher-level, moredeclarative interface. Until the early 1980s the performance benefits of the low-levelnavigational interfaces offered by hierarchical and network databases were persuasive formany large-scale applications, but as hardware became faster, the extra productivity andflexibility of the relational model led to the gradual obsolescence of the network model incorporate enterpriseusage.
3.Draw an ER diagram for Institute management system.Assume suitabledata.4.Consider the following database and solve the given queries usingrelationalalgebra.EMP ( Emp-id, Emp-name, Emp-salary,dept-no)i) Find the employees working indept-10.
ii) Find employees having salary greater than20000.
iii) Find the dept no. of employeesmith.