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sql - 案例表达式中的案例表达式

问题描述

我正在使用 LIMS 数据库软件，并试图为我们的分析师简化事情。

最初我有这个直接的案例陈述，它适用于我们使用的每个“测试”

CASE

WHEN ([Dry Fertilizer].[Phosphorus ICP (< 6.99 Guar)].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.67)) 

THEN -1 ELSE 0

END

另一个

CASE
    WHEN ([Dry Fertilizer].[Phosphorus ICP (10-13.99 Guar)].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.69)) THEN -1
    ELSE 0
END

其目的是查看测试结果[磷]，与已知数字[保证]进行比较，然后计算并输出“-1”，如果它低于因此失败或“0”并通过。

现在，我没有对每个“保证”进行不同的测试，而是考虑获取所有这些数字并进行相当大的计算，但是当我尝试运行计算时，我的软件就会挂起。我可以做些什么来简化此代码或使其工作？这是代码：

CASE    When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =4) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.67)) THEN -1 ELSE 0 End

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =5) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.67)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =6) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.67)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =7) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.68)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =8) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.68)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =9) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.68)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =10) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.69)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =12) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.69)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =14) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.7)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =16) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.7)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =18) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.71)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =20) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.72)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =22) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.72)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =24) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.73)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =26) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.73)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =28) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.74)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =30) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.75)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =32) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.76)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =34) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.794)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =36) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.828)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =38) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.862)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =40) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.896)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =42) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.93)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =44) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.964)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =46) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.998)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =48) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-1.032)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =50) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-1.066)) THEN -1 ELSE 0 End 

When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =52) Then
    Case When ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-1.1)) THEN -1 ELSE 0 End 


End

标签： sqlsql-servercase

解决方案

为什么你需要一个嵌套的 CASE，你可以简单地使用 AND

 SELECT CASE When ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee] =4) AND ([Dry Fertilizer].[Phosphorus ICP].[Phosphorus] < ([Dry Fertilizer].[Phosphorus Guarantee].[Phosphorus Guarantee]-0.67)) THEN -1 
 WHEN
 WHEN
 WHEN ETC
 ELSE 0 END AS [YOURCOL]

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