text: /*
  *
  * SUBQUERYS
  *
  */
  
  select departament, avg(salary)
  from tb_colaborators
  group by departament;
  
  select name from tb_colaborators
  where departament = 'DEV';
  
  select name from tb_colaborators
  where departament in (
      select departament
      from tb_colaborators
      group by departament
      having avg(salary) > 4000
  );
  