如何在活动记录中实现此功能？

Question

我想将此问题转移到有效记录中：

我要传输的SQL语句：

SELECT user.name, user.subject
FROM user
INNER JOIN (
    SELECT name, COUNT(1) AS occurrences
    FROM user
    GROUP BY name
  ) AS user_occurrences
  ON user.name = user_occurrences.name
ORDER BY user_occurrences.occurrences DESC, user.name ASC, user.subject ASC
LIMIT 4

How to write this SQL statement?

我可以加入表，但是如何在活动记录中创建新表？谢谢。

Answer 1

Active Record类的功能非常有限。除了在join方法中编写子查询之外，你无能为力。