SQL从2个查询中划分2个值

我有以下两个问题：

  SELECT COUNT(cvu.[ID]), 'Exp' AS [Exp]
    FROM [dbo].[tblClientVehicleUnit] cvu
    WHERE ExpirationDate < GetDate()
    AND cvu.Id = '4C1'

我如何在这两者之间划分计数？它总是只返回2个值，一个称为Exp，一个称为NonExp

谢谢

试试这个： 选择Query1/Query1

在您的情况下，它将是：

select (SELECT COUNT(cvu.[ID]), 'Exp' AS [Exp]
FROM [dbo].[tblClientVehicleUnit] cvu
WHERE ExpirationDate < GetDate()
AND cvu.Id = '4C1') / (SELECT COUNT(cvu.[ID]), 'NonExp' AS [Exp]
FROM [dbo].[tblClientVehicleUnit] cvu
WHERE ExpirationDate > GetDate()
AND cvu.Id = '4C1')

---

基本上将这两个查询视为子查询，如下所示

select x.number / y.number 
from
(
  SELECT COUNT(cvu.[ID]) as number, 'Exp' AS [Exp]     
  FROM [dbo].[tblClientVehicleUnit] cvu     
  WHERE ExpirationDate < GetDate()     
  AND cvu.Id = '4C1' 
) x
join 
(
  SELECT COUNT(cvu.[ID]) as number, 'NonExp' AS [Exp]     
  FROM [dbo].[tblClientVehicleUnit] cvu     
  WHERE ExpirationDate > GetDate()     
  AND cvu.Id = '4C1'
) y on 1=1

如果您想更进一步，那么您可以将cvu.id作为选择和修改连接的一部分，这样您就可以跨所有cvu.id执行此操作

select x.id, x.number / y.number 
from
(
SELECT cvu.id, COUNT(cvu.[ID]) as number, 'Exp' AS [Exp]     
FROM [dbo].[tblClientVehicleUnit] cvu     
WHERE ExpirationDate < GetDate()     
group by cvu.Id 
) x
join 
(
SELECT cvu.id, COUNT(cvu.[ID]) as number, 'NonExp' AS [Exp]     
FROM [dbo].[tblClientVehicleUnit] cvu     
WHERE ExpirationDate > GetDate()     
group by cvu.Id 
)y on x.id = y.id

---

我刚刚做了一件事，展示了如何将两个独立查询的结果进行分割，为了得到一个非零的结果，您必须将它们转换为可分割的数据类型：

WITH 
T1 AS (SELECT DISTINCT COUNT(StudID) as NumA FROM TBL WHERE MetTarget = 'Y'), 
T2 AS (SELECT COUNT( DISTINCT FallScore + SprgScore ) as NumB FROM TBL) 
SELECT CAST(T1.NumA AS FLOAT) / CAST(T2.NumB AS FLOAT) * 100 as PctMetTgt
FROM T1, T2

---

我需要经验和非经验。这基本上表明有更多的列…在本例中，您是否只选择一列？'Exp'作为[Exp]，而'NonExp'作为[Exp]是另一列。确定！你是对的，答案只适用于1列。也许您可以创建一个函数来返回值。请尝试选择convertdecimal，x.number/y.number，然后返回0.469668

select x.id, x.number / y.number 
from
(
SELECT cvu.id, COUNT(cvu.[ID]) as number, 'Exp' AS [Exp]     
FROM [dbo].[tblClientVehicleUnit] cvu     
WHERE ExpirationDate < GetDate()     
group by cvu.Id 
) x
join 
(
SELECT cvu.id, COUNT(cvu.[ID]) as number, 'NonExp' AS [Exp]     
FROM [dbo].[tblClientVehicleUnit] cvu     
WHERE ExpirationDate > GetDate()     
group by cvu.Id 
)y on x.id = y.id

WITH 
T1 AS (SELECT DISTINCT COUNT(StudID) as NumA FROM TBL WHERE MetTarget = 'Y'), 
T2 AS (SELECT COUNT( DISTINCT FallScore + SprgScore ) as NumB FROM TBL) 
SELECT CAST(T1.NumA AS FLOAT) / CAST(T2.NumB AS FLOAT) * 100 as PctMetTgt
FROM T1, T2