Queries:

Query $1-($Select query$)$ Display the list of projects and their assigned employees and their working hours

Query $2-($Total query$)$ Display the number of employees $($how many$)$ and total hours worked for each project

Query $3-($Update query$)$ Update employee working hours for over time $($if anybody worked more than $40$ hours on any project add $50\%$ to their working hours for the extra hours, e$.$g$.$ an employee who worked $50$ hours, his working hours will be updated to $50+(50-40)*50\%=55$