mysql 从大量数据表中高效随机取n条数据

SELECT * FROM `forumdata_userttt4` AS t1 JOIN (SELECT ROUND(RAND() * ( (SELECT MAX(id) FROM `forumdata_userttt4`)-(SELECT MIN(id) FROM `forumdata_userttt4`))+(SELECT MIN(id) FROM `forumdata_userttt4`)

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