[英]Return column with running sequence number Oracle
我的簡單查詢返回的數據如下:
SELECT column1, column2 FROM table1
COLUMN1 COLUMN2
------- -------
CA A
CA B
CB C
CB D
我想用這些值返回column3(對於相同的COLUMN1值,我想返回相同的序列號):
COLUMN3
-------
1
1
2
2
您可以使用analytic
功能DENSE_RANK
。
SELECT column1, column2, DENSE_RANK() OVER(ORDER BY column1) as "column3" FROM table1
請參見以下示例: oracle-base.com/articles/misc/rank-dense-rank-first-last-analytic-functions.php#dense_rank
試試這個查詢,
Select column1, column2,
dense_rank() over (order by column1) as column3
from table1;
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