oracle 中自带函数wm_concat排序
在wm_concat 连接字符串时发现有时不会按你要求的排序
比如 一个表test有字段 id,name ,product ,num
select name ,(select wm_concat( product'('||tot_num')')
from ( select name ,product ,sum(num) tot_num, row_number() over (partition by name order by sum(num) desc ) as rn
from test group by name ,product ) m where rn
from test n
group by name
在子查询排好序在关联 发现 连接的字段就按sum(num)的大小排序了
select name, wm_concat( product'('||tot_num')') from (select name ,product ,sum(num) tot_num,
row_number() over (partition by name order by sum(num) desc ) as rn
from test group by name ,product
) where rn
group by name
这样就没排序了
感觉在使用wm_concat()函数你需要排序！那么在关联前确认他是否已排好序
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