SQL，关键字 'FROM' 附近的 CASE 语句语法不正确

Question

我试图让下面的代码工作，两段代码(在 WHEN 部分和 ELSE 部分)分别工作，但是当在此使用时CASE 语句我收到错误

"Incorrect syntax near 'CAST', expected 'AS'." error.

基本上，如果 WHEN 语句代码等于或大于 24，则使用 THEN 语句，如果其低于 24，则使用 ELSE 声明。

在尝试了几个小时后，我似乎无法让它工作，任何关于我哪里出错的指示将不胜感激。

SELECT CASE 
        WHEN 
            (convert(float,datediff(mi, start_work, end_work))/60) >= '24'
        THEN
            (convert(float,datediff(mi, start_work, end_work))/60)
        ELSE
            (CAST(convert(varchar(2), dateadd(minute, datediff(minute, start_time, end_time), 0), 114) 
            * 60 + RIGHT (convert(varchar(5), dateadd(minute, datediff(minute, start_time, end_time), 0), 114),
            CASE WHEN CHARINDEX(':',convert(varchar(5), dateadd(minute, datediff(minute, start_time, end_time), 0), 114)) > 0
            THEN LEN(convert(varchar(5), dateadd(minute, datediff(minute, start_time, end_time), 0), 114))-3
            ELSE LEN(convert(varchar(5), dateadd(minute, datediff(minute, start_time, end_time), 0), 114))
            END) AS decimal) / 60
FROM  NDB.dbo.statusa 
INNER JOIN NDB.dbo.details ON statusa.vkey = details.vkey
INNER JOIN NDB.dbo.chegu ON statusa.ckey = NDB.dbo.chegu.gkey
WHERE start_time!= end_time AND string1 = Visit_Id and NDB.dbo.chegu.name = 'loft'
     AS [Working]

Answer 1

您需要关闭您的case语句

 case when ... then ... else ... end