Sql 通过两次返回第一列值进行分组

我有如下数据：

ACC311  Female  3
ACC311  Female  1
ACC311  Female  4
ACC311  Male    4
ACC501  Male    4
ACC501  Male    4
ACC501  Male    4
ACC501  Male    4
.
.
.

现在我使用下面的查询来获得结果

Select distinct coursecode, gender, Count(CQ) as CQ from Table1
group by Coursecode, gender
order by Coursecode

它返回的结果如下，这显然是不正确的 按照要求输出的方式（见下文）

我需要获得以下信息：

CourseCode  Total   Male    Female  CQ

ACC311      67      45      22      11

ACC501      713     485     228     111

您的查询返回行“两次”，因为您按

Coursecode，gender

分组

DISTINCT

也不会有帮助

获得所需结果的最简单方法是使用条件聚合：

SELECT Coursecode,
       Count(CQ) AS CQ,
       COUNT(gender) AS Total,
       COUNT(CASE WHEN gender = 'Male' THEN 1 END) AS Male,
       COUNT(CASE WHEN gender = 'Female' THEN 1 END) AS Female
FROM Table1
GROUP BY Coursecode

SELECT Coursecode,
       Count(CQ) AS CQ,
       COUNT(gender) AS Total,
       COUNT(CASE WHEN gender = 'Male' THEN 1 END) AS Male,
       COUNT(CASE WHEN gender = 'Female' THEN 1 END) AS Female
FROM Table1
GROUP BY Coursecode