Mysql随机插入数字、日期、时间戳

随机日期如下:针对于datetime格式

CREATE TABLE test_random_time (
id  int,
newstime  datetime
);

INSERT INTO test_random_time
SELECT 1,  '2012-11-13 01:00:00'  UNION ALL
SELECT 2,  '2012-11-13 02:00:00'  UNION ALL
SELECT 3,  '2012-11-13 03:00:00'  UNION ALL
SELECT 4,  '2012-11-13 04:00:00'  UNION ALL
SELECT 5,  '2012-11-13 05:00:00';

-- 20点至23点。
-- 区间=3小时=180分钟=10800秒
-- 下面更新时间 = '2012-11-13 20:00:00' 之后的 随机秒数。（区间在 1- 10800 之间）
UPDATE test_random_time
SET
newstime = DATE_ADD('2012-11-13 20:00:00',  INTERVAL  FLOOR(1 + (RAND() * 10800))   SECOND )
WHERE
DATE(newstime) = '2012-11-13';

UPDATE `表名` a SET a.列名= (SELECT 1419955200-(FLOOR(1 + (RAND() * 12))*2678400)-(FLOOR(1 + (RAND() * 31))*86400)-FLOOR(1 + (RAND() * 86400)))

UPDATE 表名 a set a.列名=ceiling(rand()*500)