MYSQL从两行中随机选择

Question

有人可以帮我解决这个问题。 我有这个样本表：

文件表

• UID
• 文件
• uploaded_on_date
• VIEW_COUNT

我要考虑的是最近上传的30个文件和前30个查看次数最多的文件，然后随机选择并且< strong>限制10 。

我是这个mysql复杂查询的新手。一个示例查询会很好，我将能够理解它。 谢谢。

Answer 1

SELECT 
  *
FROM 
(
SELECT
  *
FROM
  tablefile
ORDER BY
  uploaded_on_date DESC
LIMIT 30
UNION SELECT
 *
FROM
  tablefile
ORDER BY
  view_count DESC
LIMIT 30
)
ORDER BY 
   RAND()
LIMIT 10;

Answer 2

select * from (
    select * from table order by upload_on_date desc limit 30
    union
    select * from table order by view_count desc limit 30) t 
order by rand() limit 10