日期更改时如何引用

Question

我需要在日期更改时有计数行，所以我有参考日期

Date       Ref
01/01/2016  1
01/01/2016  1
01/01/2016  1
02/01/2016  2
02/01/2016  2
05/01/2016  3
05/01/2016  3
05/01/2016  3
07/01/2016  4
07/01/2016  4
07/01/2016  4
07/01/2016  4
12/01/2016  5
12/01/2016  5
12/01/2016  5
12/01/2016  5

Answer 1

在SQL Server中，您可以使用dense_rank()：

来计算

select t.*, dense_rank() over (order by date) as ref
from t;