oracle取随机结果测试

create table t as select * from all_objects where rownum <= 5000;

 

select object_name, object_id

from ( select object_name, object_id

from t

where object_name like '%%'

order by dbms_random.random )

where rownum <= 4;

 

 

select object_name, object_id

from ( select object_name, object_id

from t sample ( 1 )

where object_name like '%%'

order by dbms_random.random )

where rownum <= 4;

 

 

create table tt(ss number(10));

 

declare

 v_out number(3);

 i     number(10);

begin

  i := 1;

  while i <= 10000 loop

  begin 

    insert into tt values(i);

    i := i + 1;

  end;

  end loop;

  --dbms_output.put_line(v_out);

end;

/

commit;

 

select dbms_random.random from dual;

 

select * from (select * from tt order by dbms_random.random) where rownum<11;