SQL內部聯接不起作用

Question

我正在嘗試獲取一個SQL查詢，以一次更新我網站上的每個銀行帳戶。

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

那就是數據庫的SQL

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

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

SQL查詢根本不更新任何內容。

Answer 1

嘗試

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

Answer 2

您是否要使用選擇內容進行更新？ 如果是這樣，您就錯過了Sele

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