如何在sql中使用'when - between'語句？

此查詢給出了when-between行的語法錯誤。我如何解決它們？如何在sql中使用'when - between'語句？

alter FUNCTION [dbo].[fn_GetActivityLogsArranger] 
(
@time AS nvarchar(max) 
) 

RETURNS nvarchar(max) 
AS 
BEGIN 
declare @Return varchar(30) 

select @Return = case @time 
when between '15:00' and '15:30' then '15:00-15:30' 
when between '15:30' and '16:00' then '15:30-16:00' 
when between '16:00' and '16:30' then '16:00-16:30' 
when between '16:00' and '16:30' then '16:00-16:30' 
when between '16:30' and '17:00' then '16:30-17:00' 
when between '17:00' and '17:30' then '17:00-17:30' 
when between '17:30' and '18:00' then '17:30-18:00' 
else 'Unknown' 
Return @Return 
end

來源

2009-05-06 Penguen

alter FUNCTION [dbo].[fn_GetActivityLogsArranger] 
(
    @time AS varchar(30) 
) 
RETURNS 
varchar(30)AS 
BEGIN 
declare @Return varchar(30) 
select @Return = case 
when @time between '15:00' and '15:30' then '15:00-15:30' 
when @time between '15:30' and '16:00' then '15:30-16:00' 
when @time between '16:00' and '16:30' then '16:00-16:30' 
when @time between '16:00' and '16:30' then '16:00-16:30' 
when @time between '16:30' and '17:00' then '16:30-17:00' 
when @time between '17:00' and '17:30' then '17:00-17:30' 
when @time between '17:30' and '18:00' then '17:30-18:00' 
else 'Unknown' 
end 
Return @Return 
end

來源

2009-05-06 08:53:10

請downvoter介意留下評論。謝謝 – 2009-05-06 09:09:28

您不能使用該格式的大小寫語法。你將不得不做這做檢查的情況下：

select @Return = case 
when @time between '15:00' and '15:30' then '15:00-15:30' 
when @time between '15:30' and '16:00' then '15:30-16:00' 
when @time between '16:00' and '16:30' then '16:00-16:30' 
when @time between '16:00' and '16:30' then '16:00-16:30' 
when @time between '16:30' and '17:00' then '16:30-17:00' 
when @time between '17:00' and '17:30' then '17:00-17:30' 
when @time between '17:30' and '18:00' then '17:30-18:00' 
else 'Unknown' END 

Return @Return

而且，你缺少你的case語句的結束的結束（見大寫END以上）。

來源

2009-05-06 08:51:54 Jonathan

那麼對於初學者，你需要通過你的@Variable在每個時聲明

select @Return = case 
when @time between ('15:00' and '15:30') then '15:00-15:30' 
when @time between ('15:30' and '16:00') then '15:30-16:00' 
when @time between ('16:00' and '16:30') then '16:00-16:30' 
when @time between ('16:00' and '16:30') then '16:00-16:30' 
when @time between ('16:30' and '17:00') then '16:30-17:00' 
when @time between ('17:00' and '17:30') then '17:00-17:30' 
when @time between ('17:30' and '18:00') then '17:30-18:00' 
else 'Unknown'

來源

2009-05-06 08:52:34

你需要有自己的變量在每個WHEN子句如。

case 
    when @time between '15:00' and '15:30' then '15:00-15:30' 
    when @time between '15:30' and '16:00' then '15:30-16:00'

來源

2009-05-06 08:53:41

情況語法： CASE WHEN邏輯表達式THEN result_expression [... N] [ELSE else_result_expression] END

來源

2009-05-06 08:57:41

你不應該使用這個功能，你應該有一個表或表值函數的時間桶，所以你可以做一個純粹的聯合反對它。例如，請參閱my other post。連接將遠勝於在行集上調用函數的方法。

來源

2009-05-06 13:35:35 ahains

如何在sql中使用'when - between'語句？

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