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oracle取隨機結果測試

來源:中國IT實驗室 作者:佚名 發表于:2013-07-16 15:45  點擊:
oracle取隨機結果測試 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; selec
 oracle取隨機結果測試  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;

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