1. 程式人生 > >查詢各個員工的員工號,員工名及其所在部門的平均工資

查詢各個員工的員工號,員工名及其所在部門的平均工資

 select employeeid, firstname, d.avgsal
                  from employee,
                 (select departmentid, avg(salary)
                    from employee
                   group by departmentid) d
                 where employee.departmentid = d.departmentid