这问题是什么问题？

Question

如果有任何问题，请相信此查询：

SELECT [travel], [service], [travelid], [fro_m], [t_o], [dep], [arr], [booking_closed],
[discount], [faresleeper], [rating], [seats], [s_no], 
[fare] = 
CASE 
  WHEN @date >= Cast(Convert(varchar(20),s1from,101) as datetime
    AND @date >= Cast(Convert(varchar(20),s1to,101) as datetime 
  THEN s1rate 
  ELSE fare 
END 
FROM a1_volvo WHERE  ( fro_m = @fro_m ) AND ( t_o = @t_o ) 

Answer 1

SELECT [travel], [service], [travelid], [fro_m], [t_o], [dep], [arr], [booking_closed],
[discount], [faresleeper], [rating], [seats], [s_no], 
[fare] = 
CASE 
  WHEN @date >= Cast(Convert(varchar(20),s1from,101) as datetime)
    AND @date >= Cast(Convert(varchar(20),s1to,101) as datetime )
  THEN s1rate 
  ELSE fare 
END 
FROM a1_volvo WHERE  ( fro_m = @fro_m ) AND ( t_o = @t_o ) 

Answer 2

在 WHEN 语句中，不应该是

当@date ＆gt; = 施展（转换（varchar（20），s1from，101）作为日期时间

AND @date ＆lt; = Cast（转换（varchar（20），s1to，101）为datetime

如果是范围检查，则大于等于，等于

Answer 3

检查您的演员表应该强制转换（列为数据类型），并且还要考虑大于等于“＆gt; =”且小于等于“＆lt; =”正如il_guru所说的那样。 :) 看看这个......

SELECT [travel], [service], [travelid], [fro_m], [t_o], [dep], [arr],
  [booking_closed], [discount], [faresleeper], [rating], [seats], [s_no],      
  [fare] = CASE WHEN @date >= Cast(Convert(varchar(20),s1from,101) as datetime)
       AND @date <= Cast(Convert(varchar(20),s1to,101) as datetime)
       THEN s1rate ELSE fare END  
FROM a1_volvo  

-- use this where clause if fro_m and t_o are not datetime
WHERE (fro_m = @fro_m ) AND ( t_o = @t_o )

-- else use this where clause if fro_m and t_o have datetime of datatypes
WHERE ( Cast(Convert(varchar(20),fro_m,101) as datetime) = @fro_m ) 
AND (  Cast(Convert(varchar(20),t_o,101) as datetime) = @t_o )

Answer 4

删除[fare] =然后重试。