SQL Inner Join无法正常工作

Question

我试图获取一个SQL查询，在我的网站上一次更新每个银行帐户。

UPDATE 
        bank_accounts
    SET bank_accounts.balance = bank_accounts.balance * XI.incomeX
    FROM
        bank_accounts BA
    INNER JOIN
        users XI
    ON
        BA.uid = XI.uid

那就是SQL 数据库看起来像

+-----+----------+
| uid | balance  |
+-----+----------+
| 1   | 200      |
| 2   | 2200     |
| 3   | 89189    |
| 4   | 12834894 |
+-----+----------+

+-----+---------+
| uid | incomeX |
+-----+---------+
| 1   | 2       |
| 2   | .4      |
| 3   | 9000    |
| 4   | 14      |
+-----+---------+

SQL查询根本没有更新任何内容。

Answer 1

尝试

UPDATE 
        bank_accounts
    INNER JOIN
        users XI
    ON
        bank_accounts.uid = XI.uid
    SET bank_accounts.balance = bank_accounts.balance * XI.incomeX

Answer 2

您是否尝试使用选择进行更新？如果是这样，你就错过了选择

SET bank_accounts.balance = SELECT bank_accounts.balance * XI.incomeX