To make three tables from one table

Question

Hi,
I have created a random table from a big table and now i want to make three tables of same numbers, means each table should contain 1000 records, as the table has random idx column, so i cant divide directly on basis of idx. in addition, i cant create three seperate tbles from main table, as i dont want any duplicate data in those three tables, whcih may occur if i will create each table individually.
Best regards,

Answer 1

Table 1.
create table emp1 as
select empno,ename,sal--,................
from(select e.*,row_number() over(order by rowid) rn,count(*) over(order by null) cnt
     from emp e)
where rn < cnt/3
Table 2.
create table emp1 as
select empno,ename,sal--,................
from(select e.*,row_number() over(order by rowid) rn,count(*) over(order by null) cnt
     from emp e)
where rn between cnt/3 and cnt*2/3
Table 3.
create table emp1 as
select empno,ename,sal--,................
from(select e.*,row_number() over(order by rowid) rn,count(*) over(order by null) cnt
     from emp e)
where rn > cnt*2/3