sql - TSQL 存储过程：如果计算值大于 1，则存储过程中的 If Else 语句返回 1

Question

我有以下存储过程：

@Beginn Datetime,
@End Datetime
as
Begin
select  DATE,
IF((((SUM(ScheduleTime*(OkParts/100))/ SUM(PLannedTime)))) >1) then 1 else (((SUM(ScheduleTime*(OkParts/100))/ SUM(PLannedTime)))
from Rawdata where PartNo>0 and DATE> @Beginn and DATE< @End 
Group by DATE
Order by DATE DESC
End

但是，该过程会引发错误。

计算值是一个百分比值。由于用户输入不正确，在极少数情况下该值可能高达 250%，因此我想返回 1（逻辑上该值只能为 100%），否则只返回计算值。我还没有找到为存储过程返回的值设置绝对上限的函数。

Answer 1

可能这对你有用：

@Beginn Datetime,
@End Datetime
as
Begin
select  DATE,
case when SUM(ScheduleTime*(OkParts/100))/ SUM(PLannedTime) >1 then 1 
    else SUM(ScheduleTime*(OkParts/100))/ SUM(PLannedTime) end
from Rawdata where PartNo>0 and DATE> @Beginn and DATE< @End 
Group by DATE
Order by DATE DESC
End

Answer 2

问题是您不能在 select 语句中使用流控制语句（例如 if...else、while...）。您可以改用 CASE 语句。

Declare @Beginn Datetime
Declare @End Datetime

as
Begin
select  DATE,
(case when SUM(ScheduleTime*(OkParts/100))/ SUM(PLannedTime) >1 then 1 
    else SUM(ScheduleTime*(OkParts/100))/ SUM(PLannedTime) end) as ALIAS
from Rawdata where PartNo>0 and DATE> @Beginn and DATE< @End
Group by DATE
Order by DATE DESC
End