Question

我想知道是否有可能出现这样的情况：

((CASE WHEN (a = 1 AND b = 1) OR c = 0 THEN xyz ELSE 0))

我可以看到很多带有AND的CASE，但是没有OR。

还有一件事是需要像

这样的SELECT查询

Select x,y,z, SUM(( CASE WHEN .....))

来自表格。

任何帮助将不胜感激

CREATE PROCEDURE abc
@sid int
AS
BEGIN
SELECT
  Column1,
  Column2,
  Column3,
  SUM((CASE WHEN ((a = 1 AND b != 0 ) OR (c = 720)) THEN Amount ELSE 0 END)) 
     AS total
FROM view 
WHERE sid = @sid
END

Answer 1

我无法对此进行测试，但您需要的是以下内容。可能有一种更智能的写法。

SELECT
    Column1,
    Column2,
    Column3,
    SUM(NewAmount) AS TOTAL
FROM
SELECT
    Column1,
    Column2,
    Column3,
    CASE 
        WHEN (a = 1 AND b != 0 ) OR c = 720 THEN Amount 
        ELSE 0 
    END
    AS NewAmount
FROM 
    view 
GROUP BY
    Column1,
    Column2,
    Column3

Answer 2

这应该有效：

Select
    Column1,
    Column2,
    Column3,
    Sum(
        Case
            When ( ( a = 1 ) And ( b != 0 ) ) Or ( c = 720 ) Then Amount 
            Else 0 
        End
    ) As total
From 
    view 
Where
    sid = ...
Group By
    Column1, Column2, Column3

如果a，b和c是数字。

Answer 3

如果你想要可读的解决方案，你可以避免使用多个语句和很多圆括号。

CASE WHEN A OR B OR C THEN amount
     ELSE 0
END
<=>
CASE WHEN A THEN amount              -- this condition will be evalued first
     WHEN B THEN amount              -- second
     WHEN C THEN amount              -- and third
     ELSE 0
END

在你的情况下：

CREATE PROCEDURE abc
   @sid int
AS
BEGIN
SELECT
  Column1,
  Column2,
  Column3,
  [total] = SUM(CASE 
                   WHEN c = 720          THEN Amount
                   WHEN a = 1 AND b != 0 THEN Amount 
                   ELSE 0 
                END)  
FROM view 
WHERE sid = @sid
GROUP BY Column1, Column2, Column3
END

请注意，您需要将GROUP BY用于未包含聚合函数的列。

<小时/> 我将使用user defined table valued function而不是存储过程的第二件事：

CREATE FUNCTION [dbo].[abc](@sid int)
RETURNS TABLE
AS
RETURN (
    SELECT
      Column1,
      Column2,
      Column3,
      [total] = SUM(CASE 
                       WHEN c = 720          THEN Amount
                       WHEN a = 1 AND b != 0 THEN Amount 
                       ELSE 0 
                    END)  
    FROM view 
    WHERE sid = @sid
    GROUP BY Column1, Column2, Column3
);

然后我可以用resultset做任何我想做的事情：

SELECT *
FROM [dbo].[abc](1)
WHERE Column1 = 'xxx'

存储过程中CASE STATEMENT中的“OR”条件

3 个答案: