1.隨機讀取連續多條記錄。經過實踐，可以隨機讀取多條連續的數據記錄，里頭取值的一般都是主鍵ID來進行最大值、最小值的讀取：

SELECT * FROM example_table AS t1 JOIN (SELECT ROUND(RAND() * ((SELECT MAX(id) FROM example_table)-(SELECT MIN(id) FROM example_table))+(SELECT MIN(id) FROM example_table)) AS id) AS t2 WHERE t1.id >= t2.id ORDER BY t1.id LIMIT 5;

2.隨機多條數據。以下兩種都是隨機讀取數據，查詢數據速度、隨機范圍都基本相差不大

SELECT * FROM example_table WHERE id >= ((SELECT MAX(id) FROM example_table)-(SELECT MIN(id) FROM example_table)) * RAND() + (SELECT MIN(id) FROM example_table) LIMIT 5;

SELECT * FROM example_table WHERE id>=(SELECT floor(RAND() * ((SELECT MAX(id) FROM example_table)-(SELECT MIN(id) FROM example_table)) + (SELECT MIN(id) FROM example_table))) ORDER BY id LIMIT 5;