計數中缺少函數錯誤

Question

我有2個數據表，僱員和部門。我想顯示部門編號，部門名稱，每個部門的員工數量，每個部門的平均工資，員工姓名，工資以及員工的工作ID。這是我爲我的代碼寫的內容：

select d.department_id, d.department_name, e.count(*) Employees, 
avg(e.salary) Avg_salary, e.last_name, e.salary, e.job_id 
from departments d join employees e 
on d.department_id = e.department_id 
group by d.department_id, d.department_name, e.last_name, e.salary, e.job_id 
order by d.department_id; 

但是，運行代碼時出現錯誤「Missing Function」。我如何解決它？

Answer 1

e.count(*)應該只是count(*)。

編輯：

這是你所需要的？

COUNT(*) OVER (PARTITION BY e.department_id) DeptCt 

Answer 2

試試這個：

SELECT d.department_id, 
     d.department_name, 
     Count(*)  Employees, 
     Avg(e.salary) Avg_salary, 
     e.last_name, 
     e.salary, 
     e.job_id 
FROM departments d 
     JOIN employees e 
     ON d.department_id = e.department_id 
GROUP BY d.department_id, 
      d.department_name, 
      e.last_name, 
      e.salary, 
      e.job_id 
ORDER BY d.department_id;