帮助创建一个相当复杂的sql语句

Question

嘿大家,我不太确定如何以谷歌搜索的形式描述这个,所以我决定来这里看你们是否可以提供帮助.基本上,我想知道如何将以下伪sql转换为实际的mysql查询:

Select one random row 
  from `posts` 
 where (the user's id, which is supplied by the script) is not found in the `votes` table 
        with a post id of (the selected post's id).

如果你能提供帮助,非常感谢你.

Answer 1

像这样的东西:

SELECT *
FROM Posts
WHERE Posts.ID NOT IN (
    SELECT Votes.PostID FROM Votes WHERE Votes.UserID=@UserID
)
ORDER BY Rand()
LIMIT 1