MySql查詢隨機幾條數據
想到了 Max RAND 這幾個函數
用以下2種辦法都可以實現查詢。 速度還行。
幾十萬數據左右, 沒有什麼問題。
SELECT * FROM `news`
WHERE id >= (SELECT floor(RAND() * (SELECT MAX(id) FROM `news`)))
LIMIT 10;
SELECT *
FROM `news` AS t1 JOIN (SELECT ROUND(RAND() * ((SELECT MAX(id) FROM `news`)-(SELECT MIN(id) FROM `news`))+(SELECT MIN(id) FROM `news`)) AS id) AS t2
WHERE t1.id >= t2.id
LIMIT 10;