随机日期范围选择

Question

我试图实现从随机日期范围表中选择。像

SELECT * FROM my_table WHERE timestamp 
BETWEEN <random_date> AND <the_same_random_date> - INTERVAL 1 DAY 

这样我应该选择一个随机日期的1天的时间间隔。有什么建议么？

更新：所以随机查询可能有如下那些相同的效果：

SELECT * FROM my_table WHERE timestamp 
BETWEEN '2011-08-05 00:00' AND '2011-08-05 00:00' - INTERVAL 1 DAY 

SELECT * FROM my_table WHERE timestamp 
BETWEEN '2011-08-12 14:30' AND '2011-08-12 14:30' - INTERVAL 1 DAY 

SELECT * FROM my_table WHERE timestamp 
BETWEEN '2011-05-11 06:15' AND '2011-05-11 06:15' - INTERVAL 1 DAY 

SELECT * FROM my_table WHERE timestamp 
BETWEEN '2011-03-03 21:11' AND '2011-03-03 21:11' - INTERVAL 1 DAY 

Answer 1

SELECT * 
FROM 
    my_table 
    CROSS JOIN (SELECT FROM_UNIXTIME(RAND() * 2147483647) random_date) rd 
WHERE 
    timestamp BETWEEN (rd.random_date - INTERVAL 1 DAY) AND rd.random_date 

Answer 2

在使用期间，较小的（早期）值必须是第一位的。例如，而不是

SELECT * FROM my_table WHERE timestamp 
BETWEEN '2011-08-05 00:00' AND '2011-08-05 00:00' - INTERVAL 1 DAY 

您可能需要使用

SELECT * FROM my_table WHERE timestamp 
BETWEEN '2011-08-05 00:00' - INTERVAL 1 DAY AND '2011-08-05 00:00' 

你问如何使用MySQL来生成这些随机的日期？或者你只是想知道为什么你的查询不起作用？如果你想要生成随机日期，Karolis的答案应该为你准备好。