Question

我似乎无法使我的SP工作：

ALTER PROCEDURE [dbo].[TestSP]
@participant_role nvarchar(max) = null,
@active int,
@inactive int
AS
BEGIN

select * from participant_list where participant_role = ISNULL(@participant_role, participant_role)

and 
case when @active = 0 then ((effective_end_date IS NULL) or (effective_end_date > CURRENT_DATE))

case when @inactive = 0 then ((effective_end_date IS NOT NULL) or (effective_end_date < CURRENT_DATE))

ELSE
--Return everything

END

如果@active为0，则发生的情况是，查询应包含条件((effective_end_date IS NULL) or (effective_end_date > CURRENT_DATE))

同样明智的是，如果@inactive为0，则条件应包括((effective_end_date IS NOT NULL) or (effective_end_date < CURRENT_DATE))

如果@active和@inactive都不是0，那么它应该返回所有内容（此部分没有条件）。我如何使它工作？

Answer 1

似乎有一种特殊的痛苦，人们发现SQL的CASE表达式似乎立即停止考虑更简单的布尔运算符：

select * from participant_list
where participant_role = ISNULL(@participant_role, participant_role)
and
(
  (
     @active = 0 and (
        (effective_end_date IS NULL) or
        (effective_end_date > CURRENT_DATE)
     )
  ) or
  (
     @inactive = 0 and effective_end_date < CURRENT_DATE
  ) or
  ( @active = 1 and @inactive = 1)
)

Answer 2

SELECT  *
FROM    mytable
WHERE   ...
        AND
        CASE
        WHEN    @active = 0 AND ((effective_end_date IS NULL) or (effective_end_date > CURRENT_DATE)) THEN
                1
        WHEN    @inactive = 0 AND ((effective_end_date IS NOT NULL) or (effective_end_date < CURRENT_DATE)) THEN
                1
        ELSE
                1
        END = 1

Answer 3

select * from participant_list 
where participant_role = ISNULL(@participant_role, participant_role)
and 
(
  (@active = 0 and (effective_end_date IS NULL or effective_end_date > CURRENT_DATE))
 or
 (@inactive = 0 and (effective_end_date IS NOT NULL or effective_end_date < CURRENT_DATE))
 or 
  (@active != 0 and @active != 0)
)

Answer 4

使用案例

    select * from participant_list 
    where (@participant_role IS NOT NULL AND participant_role = @participant_role)

and 1 = (case  when @active = 0 AND (effective_end_date IS NULL or (effective_end_date     > GETDATE())) 
then 1

 when @inactive = 0 AND (effective_end_date IS NOT NULL or (effective_end_date < GETDATE()) )
then 1

WHEN @active = 0 AND @inactive = 0 
THEN 1

else 0 end)

案例何时处于条件状态

4 个答案: