mysql如何编写获取随机几条数据的sql？
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共有六种方法，第三种查询效率最高：
1：SELECT * FROM tablename ORDER BY RAND() LIMIT 想要获取的数据条数；
2：SELECT *FROM `table` WHERE id >= (SELECT FLOOR( MAX(id) * RAND()) FROM `table` ) ORDER BY id LIMIT 想要获取的数据条数;
3：SELECT * FROM `table` AS t1 JOIN (SELECT ROUND(RAND() * (SELECT MAX(id) FROM `table`)) AS id) AS t2 WHERE t1.id >= t2.id...
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by thinkfuture
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