如何在SQL查询中生成序列号？

Question

Id  Desc     Sequenceno
-----------------------------
84  TEST         1
84  TEST2        2
84  TEST3        3
85  IPhone       1
85  IPhone1      2
87  Nokia        1
88  Vivo         1
88  Vivo1        2

我有Id和Desc列。如何获得上面的Sequenceno列？

先谢谢。

Answer 1

使用ANSI标准row_number()函数：

select t.*, row_number() over (partition by id order by [desc]) as seqnum
from t;

Answer 2

试试这个：

SELECT
  Id, [Desc], 
  ROW_NUMBER() OVER (PARTITION BY Id ORDER BY Id) AS Sequenceno
FROM #Temp;