Question 7: Figure 01 represents a relational schema of Human Resource (HR) database of a large organizit different regions of the world. Referential integrity constraints are shown as directed organization operating in Write down a single relational (algebraic) expression for each of tha x1 as directed arcs in the Figure of CARTESIAN PRODUCT. a) What is the average salary of 'Sales Manager'? b) Which employees were hired before their manager? c) How many employees work in 'Asia'? d) Provide job history of all the employees who are working in 'New York'. Don't use EQUI JOIN. c) List the details of all the departments where minimun salary is more than 5000 Rs. rage 3 or 3