mysql的SELECT和COUNT WHERE

Question

我有兩個表（讓我們稱之爲他們的情況和用戶）的結構是這樣的：案例

ID|status  |user_id 
__|____________|_______ 
1 |Open  |6 
2 |Closed  |9 
3 |Incomplete |9 

用戶：

ID| 
__|_____ 
6| 
9| 

我想選擇一個計數該ID以及每個狀態字段的計數。

目前我曾嘗試：

SELECT COUNT(c.id), COUNT(
(SELECT status from cases where status = 'Open')), 
COUNT(
(SELECT status from cases where status = 'Closed')), 
COUNT(
(SELECT status from cases where status = 'Incomplete')) 
FROM cases as c 
JOIN users as u on u.id = c.user_id 

我正在查詢的錯誤返回多行。

這就是我想實現

ID| Open | Closed | Incomplete |user_id 
__|______|________|____________|__________ 
2|0  |1  |1   |9 

回顧：一種計數多少ID的每個用戶ID數，併爲每個狀態的計數。

Answer 1

您可以sum

SELECT COUNT(c.id), 
SUM(c.status = 'Open') Open , 
SUM(c.status = 'Closed') Closed , 
SUM(c.status = 'Incomplete') Incomplete, 
u.id user_id 
FROM cases as c 
JOIN users as u on u.id = c.user_id 
GROUP BY u.id