使用 SQL Server 选择同时忽略 2 行重复

Question

我有这张桌子scan:

id   ip           port  text
-----------------------------
1    192.168.0.1    2   text1
2    192.168.0.1    2   text2
3    192.168.0.1    2   text3
4    192.168.0.3    2   text4

我想通过 ip+port by last id 选择但忽略重复，所以结果将是

4, 192.168.0.3,2, text4
3, 192.168.0.1,2, text3

如何使用 T-SQL 查询做到这一点？

Answer 1

你可以使用row_number():

select t.*
from (select t.*,
             row_number() over (partition by ip, port order by id desc) as seqnum
      from t
     ) t
where seqnum = 1;