mysql 随机取一条或多条数据

前天在作系统的时候让随机从一张表中选取一个或多个热词，为了更高效随机重复率低，特意研究了一下,写法以下：java SELECT * FROM `news` AS t1 JOIN (SELECT ROUND(RAND() * ((SELECT MAX(id) FROM `news`)-(SELECT MIN(id) FROM `news`))+(SELECT MIN(id) FROM `news`)

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