Question

我正在尝试根据用户拥有的积分（金钱）建立排行榜。这些点存储在多个表中，某些用户可能没有给定表中的点。

Table: account
--------------------------
| uid | name    | locker |
|-----|---------|--------|
| 1   | Bob     | 15     |
| 2   | Dave    | 2      |
| 3   | Jim     | 5      |
--------------------------

Table: container
------------------------
| account_uid | money  |
|-------------|--------|
| 1           | 4      |
| 3           | 1      |
| 3           | 2      |
| 3           | 4      |
------------------------

Table: vehicle
------------------------
| account_uid | money  |
|-------------|--------|
| 2           | 2      |
| 2           | 1      |
| 3           | 2      |
------------------------

我希望看到结果输出为 -

Bob 19
Jim 14
Dave 5

请注意，某些人的某些人没有积分。

此代码对我不起作用。它似乎以某种方式重复了点。

SELECT
  act.name,
  act.uid,
  SUM(COALESCE(act.locker,0) + COALESCE(con.money,0) + COALESCE(veh.money,0)) AS total
FROM account as act
  LEFT JOIN container as con
    ON act.uid = con.account_uid
  LEFT JOIN vehicle as veh
    ON act.uid = veh.account_uid
Group By act.name
ORDER BY total DESC

Answer 1

如何一次计算一个总数然后将它们合并为一个？

select account.uid, account.name, sum(tot.Money) as TotalMoney from
(
    (select uid, sum(Money) as Money from container
    group by uid)
    union all
    (select uid, sum(Money) as Money from vehicle
    group by uid)
) tot
inner join account on 
tot.uid = account.uid
group by account.uid

MySQL如何从多个表中获取多行的总和，然后按总降序排序结果？

1 个答案: