MySQL查询、计数问题

Question

谢谢大家 - 已解决!

我有以下代码:

SELECT region, division, SUM(staff_count) AS Total_Staff, 
(SELECT COUNT(region) FROM tresults_xyc WHERE division = 'Central' GROUP BY region) AS Total_Responses
FROM  `trespondent_xyc` 
WHERE division = 'Central'
GROUP BY region

它返回以下内容:

region  division    Total_Staff Total_Responses
1       Central     212         8
2       Central     168         8
3       Central     164         8
4       Central     180         8

列region、division和Total_Staff中包含的信息是正确的。

但是，Total_Responses 列不是 - 它显示的是该部门而不是每个区域的响应总数。

谁能给点建议吗？

提前致谢，

荷马。

Answer 1

你必须这样做:

SELECT region, division, SUM(staff_count) AS Total_Staff, 
       (
           SELECT COUNT(*) 
           FROM tresults_xyc t2
           WHERE t2.region = t1.region
       ) AS Total_Responses
FROM  `trespondent_xyc` t1
WHERE division = 'Central'
GROUP BY region