sql语句

参考以下
SQL> select * from test;

ID MC
---------- -------------
1 11111
1 22222
2 11111
2 22222
3 11111
3 22222
3 33333

已选择7行。

SQL> select id,ltrim(max(sys_connect_by_path(mc,',')),',') row2col
from (select id,mc,
id+(row_number() over(order by id)) node_id,
row_number() over(partition by id order by id) rn
from test)
start with rn = 1
connect by node_id-1 = prior node_id
group by id
order by id;

ID ROW2COL
---------- -------------------------------------------------------------
1 11111,22222
2 11111,22222
3 11111,22222,33333

SQL> select id,replace(max(sys_connect_by_path(mc,',')),',') row2col
from (select id,mc,
id+(row_number() over(order by id)) node_id,
row_number() over(partition by id order by id) rn
from test)
start with rn = 1
connect by node_id-1 = prior node_id
group by id
order by id;

ID ROW2COL
---------- ------------------------------------------------------------
1 1111122222
2 1111122222
3 111112222233333