$3.$ Create a report showing total hours worked by each employee EMPLOYEE

$5.$ List the names of projects that involve an employee whose last name is 'Smith' as a worker or as a manager of the department that controls the project. Use nested and no nested approach

$7.$ Retrieve the top $5$ employees with the highest salaries

$10.$ Find employees who work on more than one project

$11.$ Count the number of employees in Department number $3$ who have worked on at least one project

$12.$ For each department, retrieve the department number, the number of employees in the department, and their average salary

$14.$ For each project, retrieve the project number, project name, and number of employees from department $3$ who work on the project