SQL 用 LISTAGG() 将 10 个一组的列连接起来

Question

我需要帮助编写一个可以连接一组 10 列的查询。

例子：

id1 | string1
id1 | string2
id1 | string3
...
id1 | string 1000

由于 SQL 不允许连接太大的字符串，我想一次将 10 个分组，以便得到：

id1 | string1,string2,...,string10
id1 | string11,string12,...,string20

谢谢

Answer 1

select      id,listagg (str,',') within group (order by str)

from       (select      id,str,row_number () over (partition by id order by str) - 1    as rn
            from        t
            ) 

group by    id,floor (rn / 10)
;

或者如果您不关心订单 -

select      id,listagg (str,',') within group (order by null)

from       (select      id,str,rownum - 1 as rn
            from        t
            ) 

group by    id,floor (rn / 10)
;

---

样本

create table t
as
select          'id'    || to_char(ceil(level/100))     as id
                ,'str'  || lpad(to_char(level),4,'0')   as str
from            dual
connect by      level <= 1000
;