MySQL查詢問題

Question

我目前的數據庫設置：

Forename | Surname | Department | Completion_Status 
Tom  Smith  Sales  Started 
Bob  Jones  Sales  Completed 
Alison  Baines Sales  Not Started 
Arthur  Smith  Marketing Started 
Claire  Staines Marketing Completed 

我能夠返回的行總數沒有在那裏完成狀態被啓動或完成，但不是在一個單一的任何問題，並且總數聲明 - 不過，我想做些什麼，在單個語句，是：

COUNT for Department As Total AND the COUNT for Department As Responses WHERE Completion_Status IN ('Started', 'Completed') 

這將是這個樣子：

Department | Total | Responses 
Sales  3  2 
Marketing 2  2 

希望有道理！？

謝謝荷馬。

Answer 1

select 
department, 
count(department) as total, 
sum(if(completion_status IN ('Started', 'Completed'),1,0)) as responses 
from table 
group by department 

這是一個比較標準版

select 
department, 
count(department) as total, 
sum(case when completion_status in ('Started', 'Completed') then 1 else 0 end) as responses 
from table 
group by department 

Answer 2

SELECT  部門，
              COUNT（DEPT）                            AS  總，
              COUNT（completion_status）  AS  響應
FROM       tresults
WHERE     completion_status   IN  （  '已啓動'，  '已完成'  ）
集團    BY  部門
ORDER     BY   DEP