sql選取隨機的記錄

SELECT  * FROM (SELECT * FROM login WHERE  logintime >=to_date('2018-03-01 00:00:00','yyyy-mm-dd hh24:mi:ss') and logintime <to_date('2018-07-31 23:59:59','yyyy-mm-dd hh24:mi:ss') and CLIENT_VERSION>'4.0' order by DBMS_RANDOM.RANDOM()) where rownum<=1000;