wm_concat问题
select bh,wm_concat(distinct name) aa,wm_concat(distinct id) bb from .... left join ....
类似于这样的语句查出来后name和id并不是对应的。
name id
aaa 1
bbb 2
ccc 5
ddd 3
出来后
aa bb
aaa,bbb,ccc,ddd 1,2,3,5
name和id并没有按照顺序对应，应该怎么写sql呢
结果应该是
aa bb
aaa,bbb,ccc,ddd 1,2,5,3
[解决办法]
如果name和id的distinct数量不同，也没法对应啊
[解决办法]
要是不用distinct，
可以用rownum建个排序的虚拟列，
wm_concat按照该列的顺序组合，就可以实现了。
[解决办法]
给你个例子
select m, max(r)
from (select m, wm_concat(n) over (partition by m order by n) r from t)
group by m ;
[解决办法]
select distinct wm_concat(name) over(partition by .. order by ..
rows between unbounded preceding and unbounded following) aa,
wm_concat(name) over(partition by .. order by ..
rows between unbounded preceding and unbounded following) bb from table
[解决办法]
sys_connect_by_path结合分析函数可以实现
[解决办法]
create table t1(
ID INT,
NAME varchar2(10)
);
insert into t1 values(1,'aaa');
insert into t1 values(2,'bbb');
insert into t1 values(5,'ccc');
insert into t1 values(3,'ddd');
commit;
(一)
select NAME, max(r)
from (select NAME, wm_concat(ID) over (partition by NAME order by ID) r from t1)
group by NAME ;
（二）
SELECT WMSYS.WM_CONCAT(NAME) NAME,WMSYS.WM_CONCAT(ID) ID from t1 group by NAME,ID;
[解决办法]
select listagg(ID, ',') within group(order by rownum),
listagg(NAME, ',') within group(order by rownum)
from tt;
