转自:https://jingyan.baidu.com/article/9989c74604a644f648ecfef3.html

SELECT ROW_NUMBER() OVER(PARTITION BY ta.Process_Instance_Id ORDER BY nvl(ta.status, 'D') ASC, nvl(ta.finish_date, ta.start_date) DESC) AS ROW_INDEX,
ta.*
FROM warn_task ta;

oracle的row_number() OVER (ORDER BY COL2 asc)和row_number() OVER (PARTITION BY COL1 ORDER BY COL2)的用法-LMLPHP

2、

row_number() OVER (PARTITION BY COL1 ORDER BY COL2) 表示根据COL1分组,在分组内部根据 COL2排序,而此函数计算的值就表示每组内部排序后的顺序编号(组内连续的唯一的)

oracle的row_number() OVER (ORDER BY COL2 asc)和row_number() OVER (PARTITION BY COL1 ORDER BY COL2)的用法-LMLPHP

oracle的row_number() OVER (ORDER BY COL2 asc)和row_number() OVER (PARTITION BY COL1 ORDER BY COL2)的用法-LMLPHP

这里先根据Process_Instance_Id分成若干连续的组;

类似的方法还有dense_rank()和rank over(),

参见:https://www.cnblogs.com/YuyuanNo1/p/7929543.html

05-11 13:25