nsert into downitems (chid,catid,softid,....) SELECT chid,catid,softid... FROM `downitems` WHERE itemid >= (SELECT floor(RAND() * (SELECT MAX(itemid) FROM `downitems`))) ORDER BY itemid LIMIT 1000;
插入数据
原文：http://my.oschina.net/u/2484242/blog/528693
