MySQL按不同表中的多列求和

Question

我有3張桌子：

用戶

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

喜歡

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

Transations

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

我需要為每個用戶獲取likes.like和transations.transation的總和，然后按其結果對其進行排序。

我能夠為用戶和喜歡的人做到這一點：

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

但是然后我添加事務表，如下所示：

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

顯示錯誤的結果。

我希望看到：

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

但是，請改為：

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

那么，如何按總的likes.like和transations.transation對用戶排序？

謝謝！

Answer 1

由於transactions和likes之間沒有likes關系，我認為您需要使用子查詢：

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

在對要求的更多解釋之后進行了更新 ：

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