MySQL按不同表中的多列求和排序

Question

我有 3 个表:

用户

| id | name  |
|----|-------|
| 1  | One   |
| 2  | Two   |
| 3  | Three |

喜欢

| id | user_id | like  |
|----|---------|-------|
| 1  | 1       | 3     |
| 2  | 1       | 5     |
| 3  | 2       | 1     |
| 4  | 3       | 2     |

翻译

| id | user_id | transaction |
|----|---------|-------------|
| 1  | 1       | -1          |
| 2  | 2       | 5           |
| 3  | 2       | -1          |
| 4  | 3       | 10          |

我需要为每个用户获取 likes.like 和 transations.transation 的总和，然后根据结果对其进行排序。

我能够为用户和喜欢的人做到这一点:

select users.*, sum(likes.like) as points
from `users`
inner join `likes` on `likes`.`user_id` = `users`.`id`
group by `users`.`id`
order by points desc

然后我像这样添加交易表:

select users.*, (sum(likes.like)+sum(transactions.`transaction`)) as points
from `users`
inner join `likes` on `likes`.`user_id` = `users`.`id`
inner join `transactions` on `transactions`.`user_id` = `users`.`id`
group by `users`.`id`
order by points desc

显示错误的结果。

我期待看到:

| id | name  | points |
|----|-------|--------|
| 3  | Three | 12     |
| 1  | One   | 7      |
| 2  | Two   | 5      |

但改用这个:

| id | name  | points |
|----|-------|--------|
| 3  | Three | 12     |
| 1  | One   | 6      |
| 2  | Two   | 5      |

那么，如何按 likes.like 和 transations.transation 的总和对用户进行排序？

谢谢!

Answer 1

由于transactions 和likes 之间不是一对一的关系，我认为您需要使用子查询:

select users.*,
    (select sum(points) from likes where user_id = users.id) as points,
    (select sum(transaction) from transactions where user_id = users.id) as transactions
from users
order by points desc

更新后对要求进行了更多解释:

select users.*,
    (select sum(points) from likes where user_id = users.id) +
    (select sum(transaction) from transactions where user_id = users.id) as points
from users
order by points desc