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Consider the database schema below and answer the questions that follow using SQL. EMPLOYEE->(EmpID,Firstname,Lastname,Hows_worked, Salary, SupervisorID,DepartmentID) DEPENDANT->(DependantID,Firstname,Lastname,Age,EmpID) SUPERVISOR->(SupervisorID,Firstname,Lastname,Address) DEPARTMENT->(DepartmentID,departmentname) Retrieve all employees in “sales department” whose salary is between Ksh 30,000 and Ksh 80,000. Retrieve the names of all employees in “marketing department” who work more than 10 hours and are supervisedd by “Fredrick Khamati”. List the names of all employees who have a dependent with the same first name as themselves. Retrieve all supervisors whose address is in “Nanyuki”. For each department, retrieve the departmentID, the number of employees in the department, and their average salary. Using a stored procedure,increase employee salary by 3% if his/her salary is below Ksh 20000

Consider the database schema below and answer the questions that follow using SQL. EMPLOYEE->(EmpID,Firstname,Lastname,Hows_worked, Salary, SupervisorID,DepartmentID) DEPENDANT->(DependantID,Firstname,Lastname,Age,EmpID) SUPERVISOR->(SupervisorID,Firstname,Lastname,Address) DEPARTMENT->(DepartmentID,departmentname) Retrieve all employees in “sales department” whose salary is between Ksh 30,000 and Ksh 80,000. Retrieve the names of all employees in “marketing department” who work more than 10 hours and are supervisedd by “Fredrick Khamati”. List the names of all employees who have a dependent with the same first name as themselves. Retrieve all supervisors whose address is in “Nanyuki”. For each department, retrieve the departmentID, the number of employees in the department, and their average salary. Using a stored procedure,increase employee salary by 3% if his/her salary is below Ksh 20000

Database Systems: Design, Implementation, & Management
Database Systems: Design, Implementation, & Management
12th Edition
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Carlos Coronel, Steven Morris
Chapter10: Transaction Management And Concurrency Control
Section: Chapter Questions
Problem 6P
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Consider the database schema below and answer the questions that follow using SQL.

EMPLOYEE->(EmpID,Firstname,Lastname,Hows_worked, Salary, SupervisorID,DepartmentID)

DEPENDANT->(DependantID,Firstname,Lastname,Age,EmpID)

SUPERVISOR->(SupervisorID,Firstname,Lastname,Address)

DEPARTMENT->(DepartmentID,departmentname)

  1. Retrieve all employees in “sales department” whose salary is between Ksh 30,000 and Ksh 80,000.
  2. Retrieve the names of all employees in “marketing department” who work more than 10 hours and are supervisedd by “Fredrick Khamati”.
  • List the names of all employees who have a dependent with the same first name as themselves.
  1. Retrieve all supervisors whose address is in “Nanyuki”.
  2. For each department, retrieve the departmentID, the number of employees in the department, and their average salary.
  3. Using a stored procedure,increase employee salary by 3% if his/her salary is below Ksh 20000
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