如何从最近的三行中获得随机数？

Question

I wonder how I can pick one out of the latest three rows from a table.

I have this:

"SELECT * FROM blog_content ORDER BY id DESC LIMIT 0,3"

I thought: save the result in an array and random 0-2 and pick from the array, but that wouldn't work since there's many rows.

Answer 1

如果我理解正确，那么您想从最新的3中随机选择一个。尝试执行子查询：

SELECT * FROM (SELECT * FROM blog_content ORDER BY id DESC LIMIT 0,3) t ORDER BY RAND() LIMIT 1

Answer 2

SELECT * FROM
    (SELECT * FROM blog_content ORDER BY id DESC LIMIT 0,3) last_three
ORDER BY RAND() LIMIT 1;

Answer 3

SELECT * FROM (SELECT * FROM blog_content ORDER BY id DESC LIMIT 0,3) AS recentBlogs ORDER BY RAND() LIMIT 1

为我工作。