間隔函數有問題。我用它的方式？

Question

select top 10 * 
from James.activity_gc a 
left join James.activity_gc as James.activity_gc1 b 
on a.user_id = b.user_id 
and a.time = b.time - interval '1' day 

Answer 1

對於MSSQL服務器，你可以嘗試

select top 10 * 
from James.activity_gc a 
left join James.activity_gc as James.activity_gc1 b 
on a.user_id = b.user_id 
and DATEDIFF(day, a.time, b.time) = 1 

Answer 2

問題是標籤sql-server，但SQL Server不使用Interval關鍵字。相反，你這樣做：

select top 10 * 
from James.activity_gc a 
left join James.activity_gc as James.activity_gc1 b 
    on a.user_id = b.user_id 
    and a.time = DATEADD(day, -1, b.time)