Oracle 10g：插入多行

Question

我有以下select statement：

select dte, wm_concat(issue) as issues
from ((select date_a as dte, issue from t where date_a is not null) union all
      (select date_b, issue from t where date_b is not null)
     ) di
group by dte
order by dte;

返回多行，例如：

DTE        | ISSUES
-----------+---------
01/JUN/91  | EE
01/JUN/03  | EE
01/JAN/06  | HH
01/AUG/06  | EE
01/AUG/08  | EE,HS,HE

我想将这些记录插入到一​​个表中。

问题

我应该如何编写插入语句？我应该使用游标，因为似乎 INSERT 可以一次处理一行？

Answer 1

使用选择作为插入源：

insert into some_table (dte, issues)
select dte, wm_concat(issue) as issues
from (
   select date_a as dte, issue 
   from t 
   where date_a is not null
   union all
   select date_b, issue 
   from t 
   where date_b is not null
) di
group by dte;

无需将 UNION 的各个查询放在括号之间。