mysql怎樣高效率隨機獲取n條數據

ID連續的狀況下（注意不能帶where，不然結果很差）：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不連續的狀況下

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