Consider the following schema for a COMPANY database:

EMPLOYEE $($Fname$,$ Lname, Ssn$,$ Address, Super$-$ssn$,$ Salary, Dno$)$

DEPARTMENT $($Dname$,$ Dnumber, Mgr$-$ssn$,$ Mgr$-$start$-$date$)$

DEPT$-$LOCATIONS $($Dnumber$,$ Dlocation$)$

PROJECT $($Pname$,$ Pnumber, Plocation, Dnum$)$

WORKS$-$ON $($Ess$!!,$ Pno, Hours$)$

DEPENDENT $($Essn$,$ Dependent$-$name, Sex, Bdate, Relationship$)$

Write the queries in relational algebra.

i$)$ Retrieve the name and address of all emp loyees who work for' Sales' department.

ii$)$ Find the names of employees who work on all the projects controlled by the department

number $3.$

iii$)$ List the names of all employees with two or more dependents.

iv$)$ Retrieve the names of employees who have no dependents.