带有 where 子句的 Sum 函数 - SQL 服务器

Question

我需要运行以下查询，我知道以下不正确，但也许这会让您了解我需要输出什么。

SELECT 
    [SchemeCd],          
    SUM([PayAmt] WHERE [ServiceMonth] = '201602'and [PayMonth] <> '') as [Feb-2016_P],
    SUM([PayAmt] WHERE [ServiceMonth] = '201603'and [PayMonth] <> '') as [Mar-2016_P]
INTO 
    [Claim Totals]
FROM 
    [All Claims]
GROUP BY 
    [SchemeCd]

因此，我需要计算每个特定服务月份的支付金额总额，其中支付月份不为空。然后我会做另一笔计算每个特定服务月的支付金额总和，其中支付月为空。

原版Table

[PayAmt]|  [ServiceMonth]|  [PayMonth 

 500          201602         201602
 900          201602
 500          201602         201602 
 500          201603         201603
 600          201603       
 600          201603         201603

输出 - PayMonth <> ''（不为空）

[PayAmt]|  [ServiceMonth]|  [PayMonth  
 1000       201602           201602
 1100       201603           201603

输出 - PayMonth = ''（空白）

[PayAmt]|  [ServiceMonth]|  [PayMonth  
 900        201602           201602
 600        201603           201603

Answer 1

据我了解，这应该是您的代码

SELECT [SchemeCd],SUM(Case WHEN [ServiceMonth] = '201602'and [PayMonth] <> '' THEN [PayAmt] END) as [Feb-2016_P],
SUM(Case WHEN [ServiceMonth] = '201603'and [PayMonth] <> '' THEN [PayAmt] END) as [Mar-2016_P]

INTO [Claim Totals]
FROM [All Claims]
GROUP BY [SchemeCd]

带有 where 子句的 Sum 函数 - SQL 服务器

Sum Function with a where clause - SQL Server

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