tsql - 或在 Case 语句中

Question

试图弄清楚如何在 T-SQL 的 case 语句中合并 OR

我本质上是在检查两件事，如果其中任何一个是真的，就将它们视为 0 进行计数。

COUNT(Case When (car[Weight] IS null) then 0 else car.CarKey 
           OR When (car.BinNumber is null) then 0 else car.CarKey 
      End) as Carkey

也试过了，但语法错误

COUNT(Case When (car[Weight] IS null) then 0 
         else When (car.BinNumber is null) then 0 
         else car.CarKey 
      End) as Carkey

score 3 · Accepted Answer

您可以使用OR这种方式：

COUNT(Case 
        When (car.[Weight] IS null) or (car.BinNumber is null)
        then 0 
        else car.CarKey End) as Carkey

score 1 · Accepted Answer

您的第二次尝试很接近，只需删除一次else

COUNT(Case When (car[Weight] IS null) then 0 
     When (car.BinNumber is null) then 0 
     else car.CarKey 
  End) as Carkey

注意：如果您想计算没有空值的项目，那将不会这样做。零值仍然是一个值，因此它也会被计算在内。用于null您不想计算的项目：

COUNT(Case When (car[Weight] IS null) then null 
     When (car.BinNumber is null) then null 
     else car.CarKey 
  End) as Carkey

或sum改用：

SUM(Case When (car[Weight] IS null) then 0 
     When (car.BinNumber is null) then 0 
     else 1
  End) as Carkey

2 回答 2