Question

我理解MSSQL没有LEAST功能，并且CASE提供了一个合理的替代方案，但是，出于某种原因，我正在努力使其工作。

目前的代码是：

SELECT CAST(CAST(@QueryStartDate AS DATE) AS DATETIME) + CAST(tt.Time as datetime) as  [Time],
    COALESCE(td.[Max Time],0) AS [Max Time]

我正在尝试改为：

SELECT CAST(CAST(@QueryStartDate AS DATE) AS DATETIME) + CAST(tt.Time as datetime) as  [Time],
    CASE [Max Time] 
        WHEN td.[Max Time] > 9.00
        THEN 9.00 ELSE COALESCE(td.[Max Time],0)
    END

但似乎无法让它发挥作用！如果有人能让我知道我哪里出错了，我将不胜感激。感谢

Answer 1

select cast(null as float) as [Max Time] into #tmp
insert into #tmp select 3.0
insert into #tmp select 12.0

select * from #tmp

select case 
    when coalesce([max time], 0.0) < 9.0 then 9.0
    else [Max Time]
end
from #tmp

在MSSQL中对最大计算应用上限 - 类似于Least（）

1 个答案: