mysql 隨機取一條或多條數據

前天在作系統的時候讓隨機從一張表中選取一個或多個熱詞，爲了更高效隨機重複率低，特意研究了一下,寫法以下：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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