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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;
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原文地址：http://my.oschina.net/u/2484242/blog/528693
