复杂SQL查询语句
原表t：
a b
1 1
1 11
1 111
2 2
2 22
2 222
目标记录集：
a b c
1 1 1
1 11 2
1 111 3
2 2 1
2 22 2
2 222 3

[解决办法]
select a,b,length(b) from 表T
[解决办法]
SQL> select a, b, row_number()over(partition by a order by b) from (
2 select 1 a, 1 b from dual union all
3 select 1 a, 11 b from dual union all
4 select 1 a, 111 b from dual union all
5 select 2 a, 2 b from dual union all
6 select 2 a, 22 b from dual union all
7 select 2 a, 222 b from dual );

A B ROW_NUMBER()OVER(PARTITIONBYAORDERBYB)
---------- ---------- --------------------------------------
1 1 1
1 11 2
1 111 3
2 2 1
2 22 2
2 222 3

已选择6行。
[解决办法]
楼主没说清楚,第3列怎么来的!


结果2中都实现了!我估计是我楼上写的对
[解决办法]
select a, b, row_number()over(partition by a order by b) c from t
[解决办法]
gaozhijun(jackygao) ( ) 是正解，
看到liuyxit(初学Oracle) ( )的解答，我笑了，不过这个的确是楼主没说清楚的缘故。