如何在WHERE子句中使用COUNT，COUNTIF或SUM？

Question

我有一个employee表，我正在尝试获取没有活跃员工的部门ID列表。

我的第一次尝试是：

SELECT DISTINCT DivisionID
FROM Employees
WHERE COUNT(IsActive = 0) = 0
GROUP BY DivisionID

但是，即使intellisense认为Count也不允许使用表达式。

所以我尝试了：

SELECT DISTINCT DivisionID
FROM Employees
WHERE SUM(CAST(IsActive AS INT)) = 0
GROUP BY DivisionID

但是随后它抱怨：“除非聚集在HAVING子句或选择列表中包含的子查询中，否则聚集可能不会出现在WHERE子句中，并且所聚集的列是外部引用。”

这似乎应该是直截了当的，不确定是什么问题。

Answer 1

使用having，您可以使用条件聚合来过滤您分组的记录

SELECT DivisionID
FROM Employees    
GROUP BY DivisionID
HAVING sum(case when IsActive = 1 then 1 else 0 end) = 0

Answer 2

我怀疑这可以满足您的要求

SELECT DivisionID
FROM Employees
GROUP BY DivisionID
HAVING MAX(IsActive) = 0

Answer 3

SELECT DivisionID
from (
    SELECT DivisionID, count(*) as tmpcount from Employees WHERE IsActive=0 group by 
    DivisionID 
) 
WHERE tmpcount>0