[Oracle]快速生成大量模拟数据的方法

快速生成大量模拟数据的方法：

create table TEST(id integer, TEST_NUMBER NUMBER(18,6));

insert into TEST
 select i+j, i+j
   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
         );

这是生成10万条数据

如果生成1000完条数据，则变成：


create table TEST(id integer, TEST_NUMBER NUMBER(18,6));

insert into TEST
 select i+j, i+j
   from  (
          with DATA2(j) as (
                            select 0 j from DUAL
                              union all
                            select j+1000 from DATA2 where j < 99990000
                           )
          select j from DATA2
         ),
         (
          with DATA1(i) as (
                            select 1 i from DUAL
                              union all
                            select i+1 from DATA1 where i < 10000
                           )
          select i from DATA1
         );

本文转自健哥的数据花园博客园博客，原文链接：http://www.cnblogs.com/gaojian/p/7596248.html，如需转载请自行联系原作者