sql - Oracle 11g: union all with dbms_random -


i'm trying write sql statement in oracle 11g randomly select 5000 records union of 2 different tables same columns:

select *    (        select ename, job        emp1        union        select ename, job        emp2        order dbms_random.value()         ) rownum <= 5000

and when run it, error ora-01785: order item must number of select-list expression. when remove second table works fine. but, need select randomly 2 tables, first union them, order them randomly , select 5000 of them.

or maybe there other approach same result?

tnx help.

your order applies second part of union - you'll have perform union first , apply order by:

select *    (     select * (        select ename, job        emp1        union        select ename, job        emp2     )     order dbms_random.value() ) rownum <= 5000

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