间隔功能有问题。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

问题标记为sql-server，但Sql Server不使用Interval关键字。相反，你这样做：

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)

Answer 2

对于MSSQL Server，您可以尝试

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