mysql怎样高效率随机获取n条数据

ID连续的状况下（注意不能带where，不然结果很差）：sql SELECT * FROM `mm_account` AS t1 JOIN (SELECT ROUND(RAND() * (SELECT MAX(id) FROM `mm_account`)) AS id) AS t2 WHERE t1.id >= t2.id ORDER BY t1.id ASC LIMIT 4; ID不连续的状况下

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