dunder_projects

-- How many people work in the Sales department ?
select
  count(*)
from
  employee
where
  employee.department = 2;
  
  -- List the names of all employees assigned
-- to the 'Plan Christmas party' project.
select
  emp_name,
  project_name
from
  employee e
  join employee_project ep on e.id = ep.emp_id
  join project p on ep.project_id = p.id
where
  p.project_name = 'Plan christmas party';
  
  -- List the names of employees from the
-- Warehouse department that are assigned
-- to the 'Watch paint dry' project.
select
  emp_name,
  project_name
from
  employee
  join employee_project on employee.id = employee_project.emp_id
  join project on employee_project.project_id = project.id
  join department on employee.department = department.id
where
  department.id = 4
  AND project.id = 4;
  
-- Which projects are the Sales department
-- employees assigned to ?
select
  distinct project_name
from
  project
  join employee_project on project.id = employee_project.project_id
  join employee on employee_project.emp_id = employee.id
  join department on employee.department = department.id
where
  department.id = 2;
  
  -- List only the managers that are
-- assigned to the 'Watch paint dry' project.
select
  distinct emp_name
from
  employee
  join employee_project on employee_project.emp_id = employee.id
  join project on employee_project.project_id = project.id
  join department on employee.id = department.manager
where
  project.id = 4;