SQL语句，子查询数？ [英] SQL statement, subquery count?

问题描述

我有以下SQL表

部门

|name|employees|

员工

|name|gender|type|dead |
|John|male  |good|yes  |
|Mary|female|bad |no   |
|Joe |male  |ugly|maybe|

我想写一条返回的语句

| type | n of employees | n of male employees | n of departments |

我有

SELECT e.type, count(e), count(d) 
FROM Department d 
JOIN d.employees e
WHERE e.dead = maybe 
GROUP BY e.type

当然，这缺少'n男性雇员'。我被困在这里，因为我不确定在哪里指定附加子句e.gender = male。

That's missing the 'n of male employees', of course. I'm stuck here, since I'm not sure, where to specify the additional clause e.gender = male.

我忘了提及：HQL或标准是很好。

I forgot to mention: HQL or criteria would be nice.

推荐答案

仅供参考：

SELECT 
   e.type, 
   count(e), 
   count(d), 
   sum(case when gender = 'male' then 1 else 0 end)
from Department d 
JOIN d.employees e
WHERE e.dead = 'maybe' 
GROUP BY e.type

在HQL中工作。谢谢大家！

works in HQL. Thanks everyone!

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