[Oracle]快速构造大量数据的方法

[Oracle]快速构造大量数据的方法：
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create table tab001(id integer primary key, val varchar2(100));

insert into tab001
 select i+j,rpad(to_char(i+j),100,'A')
   from  (
          with DATA2(j) as (
                            select 0 j from DUAL
                              union all
                            select j+1000 from DATA2 where j < 999000
                           )
          select j from DATA2
         ),
         (
          with DATA1(i) as (
                            select 1 i from DUAL
                              union all
                            select i+1 from DATA1 where i < 1000
                           )
          select i from DATA1
         );

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