在我的一个应用程序中,我想将案例表达式与聚合函数相加。
我尝试了以下查询
Select Name,Sum(Case When MIN(arrival_time) = MAX(arrival_time) then 1 Else 0 End) as arrivedate from TableName group by Name
但是我遇到了这样的错误。
Msg 130, Level 15, State 1, Line 1
Cannot perform an aggregate function on an expression containing an aggregate or a subquery.
请弄清楚我的问题。提前致谢