Oracle SQL插入到With子句

@R_457_4506@，所以也许这是一个愚蠢的问题，但有可能使用With子句插入吗？还是有任何常见的解决方法？我的意思是这样的：

With Helper_table As (
SELEct * From dummy2
)
Insert Into dummy1 Values (SELEct t.a From Helper_table t Where t.a = 'X' );

谢谢！

我的例子太虚拟了，所以我添加了一些扩展代码(thx的答案到目前为止)。

INSERT
INTO    dummy values (a,b)  //more values
WITH    Helper_table AS
    (
    SELECT  *
    FROM    dummy2
    )
WITH    Helper_table2 AS   //from more tables
    (
    SELECT  *
    FROM    dummy3
    )         
SELECT  t.value as a,t2.value as b
FROM    Helper_table t 
join Helper_table t2 on t.value = t2.value //some join
WHERE   t.value = 'X' and t2.value = 'X'   //other stuff

create table t(Helper1 varchar2(50),Helper2 varchar2(50),dataElement varchar2(50) );


insert into t(Helper1,Helper2,dataelement)
with
     de as(SELEct level lvl from dual connect by level <10),h1 as (SELEct lvl,lvl/1.5 hp from dE),h2 as (SELEct lvl,lvl/2 hp2 from dE)
SELEct h1.hp,h2.hp2,de.lvl
  from de 
        inner join
       h1 on de.lvl = h1.lvl
        inner join
       h2 on de.lvl = h2.lvl
/