mysql獲取隨機數據的方法

　　order by rand() 　　數據多了極慢，隨機性非常好，適合非常小數據量的情況。 　　複製代碼 代碼如下: 　　SELECT * FROM table_name AS r1 JOIN (SELECT (ROUND(RAND() * (SELECT ABS(MAX(id)-MIN(id)-$limit) FROM table_name))+(SELECT MIN(id) from tab

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