oracle关键字with..as和wm_concat的用法说明

--假设现在有这么个需求：

   	AID	ADDRESS
1	1	北环路
2	1	南阳路
3	2	商城路
4	2	王府井

得到这样的结果：

   	AID	WM_CONCAT(ADDRESS)
1	1	北环路,南阳路
2	2	商城路,王府井

1，创建临时表with...as

with C as 
(
     select 1 id ,'北环路' address from dual 
     union all
     select 1 id, '南阳路' address from dual
     union all
     select 2 id ,'商城路' address from dual
     union all
     select 2 id, '王府井' address from dual
)
select * from C

--------------------得到结果-----------------------------------------------------------------------------------------------------

   	ID	ADDRESS
1	1	北环路
2	1	南阳路
3	2	商城路
4	2	王府井

2，相同id合并相关列wm_concat

with C as 
(
     select 1 id ,'北环路' address from dual 
     union all
     select 1 id, '南阳路' address from dual
     union all
     select 2 id ,'商城路' address from dual
     union all
     select 2 id, '王府井' address from dual
)
select id,wm_concat(address) from C group by id

--------------------得到结果-----------------------------------------------------------------------------------------------------

   	ID	WM_CONCAT(ADDRESS)
1	1	北环路,南阳路
2	2	商城路,王府井

-------------------------------------------华丽的分隔符--------------------------------------------------------

现在如果想将，号换成其它，比如“-”：

select id,regexp_replace(wm_concat(address),",","-") from C group by id

特别说明：wm_concat的用法：

================================================================

wm_concat(column)函数 http://database.51cto.com/art/201010/231126.htm

================================================================

相关推荐：

Mysql中类似此函数：group_concat

http://blog.csdn.net/xb12369/article/details/42002687