问题
I have a table with 3 columns:
ID VALUE SEQ
1 100
2 100
3 200
4 200
5 200
Whenever value in column "VALUE is repeated in further rows, value in column "SEQ" must be incremented by 1. Expected output is:
ID VALUE SEQ
1 100 1
2 100 2
3 200 1
4 200 2
5 200 3
As per my understanding it can not be done in insert query while filing data in to this table. It has to be done using post-processing may be. I guess it can be done using analytical function using "row_number() and partition by", but not sure how to do it. Please let me know, if it can be done using some better way. Any hint will be appreciated. Thanks.
回答1:
select id, value, row_number() over (partition by value order by id) as seq
from your_table;
来源：https://stackoverflow.com/questions/16298943/oracle-create-sequence-number-for-repeated-rows