一条Sql语句连接多个数据

 原文传送门：http://topic.csdn.net/u/20091028/10/f2012eb6-36b7-4a19-b8ef-52ce95401a1d.html

现有表
A:
taid
1
2
3
...

B:
tbid taid seq_no code
1    1    1    AAA 
2    1    2    BBB
3    1    3    CCC
4    2    1    XXX
5    2    2    YYY

B.taid reference A.taid
如何通过sql语句得到 试图C
taid codestr
1    AAA-BBB-CCC
2    XXX-YYY

Oracle 10g

select a.taid,replace(wm_concat(b.code),',','-')codestr from a,b where a.taid=b.taid group by a.taid

 

Oracle 9i

select taid,substr(max(sys_connect_by_path(code,'-')),2)codestr from( select a.taid,b.code, row_number()over(partition by a.taid order by b.tbid)rn from a,b where a.taid=b.taid) connect by prior taid=taid and prior rn=rn-1 start with rn=1 group by taid