Mysql SQL查询错误，需要帮助吗

我有一个问题，应该退还人们在过去一周购买的东西的一半：

UPDATE main_data SET md.amount_current = md.amount_current + (bought.total / 2) 
FROM main_data AS md 
INNER JOIN (
    SELECT DISTINCT sb.user_id, SUM(sb.spend) AS total 
    FROM shopitems_bought AS sb 
    LEFT JOIN shopitems AS si 
    ON sb.shopitem_id = si.id 
    WHERE sb.date_bought <= '2012-03-09' 
    AND sb.date_bought > DATE_ADD('2012-03-09', INTERVAL -7 DAY) 
    AND si.valid = 1 
    GROUP BY sb.user_id
) AS bought ON bought.user_id = md.user_id 
WHERE md.valid = 1

SELECT部件本身执行得很好，并返回应该退款的正确数据ID以及他们在该周的花费。然而，查询作为一个整体抛出了一个错误，说我在第2行附近的SQL语法中有一个错误，我引用：“从主数据中选择不同的sb.forum\u id，SUMsb.s”

我看不出我做错了什么。

比你上面所用的更糟糕。尝试将查询更改为：

UPDATE main_data md 
INNER JOIN (
    SELECT DISTINCT sb.user_id, SUM(sb.spend) AS total 
    FROM shopitems_bought AS sb 
    LEFT JOIN shopitems AS si 
    ON sb.shopitem_id = si.id 
    WHERE sb.date_bought <= '2012-03-09' 
    AND sb.date_bought > DATE_ADD('2012-03-09', INTERVAL -7 DAY) 
    AND si.valid = 1 
    GROUP BY sb.user_id
) bought ON bought.user_id = md.user_id 
SET amount_current = md.amount_current - (bought.total / 2) 
WHERE md.valid = 1

要减去而不是添加：

SET amount_current = md.amount_current - (bought.total / 2) 

内部联接中没有用户\u Id

UPDATE main_data SET md.amount_current = md.amount_current + (bought.total / 2) 
FROM main_data AS md 
INNER JOIN (
    SELECT sb.user_id, DISTINCT sb.forum_id, SUM(sb.spend) AS total 
    FROM shopitems_bought AS sb 
    LEFT JOIN shopitems AS si 
    ON sb.shopitem_id = si.id 
    WHERE sb.date_bought <= '2012-03-09' 
    AND sb.date_bought > DATE_ADD('2012-03-09', INTERVAL -7 DAY) 
    AND si.valid = 1 
    GROUP BY sb.user_id
) AS bought ON bought.user_id = md.user_id 
WHERE md.valid = 1

---

哦，等等，这是我的错，我把实际代码“弄糊涂”了一点。sb.forum\u id应该是sb.user\u id谢谢，问题解决了！所有这些不同的SQL版本都很烦人。

UPDATE main_data SET md.amount_current = md.amount_current + (bought.total / 2) 
FROM main_data AS md 
INNER JOIN (
    SELECT sb.user_id, DISTINCT sb.forum_id, SUM(sb.spend) AS total 
    FROM shopitems_bought AS sb 
    LEFT JOIN shopitems AS si 
    ON sb.shopitem_id = si.id 
    WHERE sb.date_bought <= '2012-03-09' 
    AND sb.date_bought > DATE_ADD('2012-03-09', INTERVAL -7 DAY) 
    AND si.valid = 1 
    GROUP BY sb.user_id
) AS bought ON bought.user_id = md.user_id 
WHERE md.valid = 1