1.通过树形结构生成随机数
select 1090900+round(rownum/2),
round(dbms_random.value(100000,10001000),0)
from dual
connect by rownum<100
2.通过笛卡尔积产生随机数
select rownum
from all_obj_colattrs,
all_obj_colattrs;
3.通过工具产生随机数
TOOLS ---> DATA GENERATOR