sql - MS Access SQL - 记录数 = TRUE

Question

我有一些看起来相当简单的东西，但这里缺少一些东西。我正在尝试显示所有不同的 [业务流程] 值，并计算每个 [业务流程] 的记录数，其中 [需要更正操作] = TRUE。对于某些 [需要更正操作] = TRUE 的 [业务流程] 值，可能存在零记录，或者值 > 0。这是我正在使用的 SQL：

SELECT  [Business Process], sum([Corrective Action Is Required]) as [Total Corrective Action Is Required]

FROM [Review Results]

WHERE [Corrective Action is Required] in 

(select IIF([Corrective Action Is Required] = TRUE, 1, 0) from [Review Results]) 

GROUP BY [Business Process]

ORDER BY [Business Process];

目前，SQL 在所有记录中显示 [需要采取总纠正措施] 的值为 0。有人可以指出我做错了什么吗？

Answer 1

在 Access 中，True=-1 和 False=0，那么如何：

SELECT [Business Process], 
       Sum(Abs([Corrective Action Is Required])) 
          as [Total Corrective Action Is Required]
FROM [Review Results]
GROUP BY [Business Process]

当您有 Group By 时，您不需要 Order By。

Answer 2

您可以对布尔值求和，但在访问中您会得到否定结果，因为 True = -1 - 所以这应该有效

SELECT  [Business Process], sum(iif([Corrective Action Is Required] = TRUE, 1, 0)) as [Total Corrective Action Is Required]
FROM [Review Results]
GROUP BY [Business Process]
ORDER BY [Business Process]

Answer 3

这样做不是更容易吗？还记得检查你的基础数据。

SELECT  [Business Process], count([Corrective Action Is Required]) as [Total Corrective Action Is Required]
FROM [Review Results]
WHERE [Corrective Action Is Required] = 1
GROUP BY [Business Process]
ORDER BY [Business Process];