自动编号按分组列在Oracle

Question

是否有oracle语句可以解决我的问题?

。表a有2列:columnA and columnB

ColumnA    ColumnB
-------------------
 A         WA
 A         WA
 B         WA
 B         WA
 C         WA
 A         CA
 A         CA
 B         CA
 B         CA
 C         CA

我想要的是:自动号码Group by ColumnA

Auto  ColumnA  ColumnB
-----------------------
1     A        WA
2     A        WA
3     A        CA
4     A        CA
1     B        WA
2     B        WA
3     B        CA
4     B        CA
1     C        WA
2     C        CA

Answer 1

可以使用ROW_NUMBER函数。按列分组，并指定一些排序子句

SELECT ROW_NUMBER () OVER (PARTITION BY columnA ORDER BY columnB) as "auto",
       columnA, columnB
  FROM table;