mysql - mysql查询更新在其他表中仅存在一次的事务（transactionID）（transactionID）

Question

我需要生成一个类似这样的 mysql 查询：

更新 TRANSACTION SET 点 = 0 WHERE TransactionID NOT IN(SELECT TransactionID, COUNT(*) FROM trans_products GROUP BY TransactionID WHERE COUNT(*) > 1)

关键是我需要更新在表“trans_products”中存在一次的“事务”表中的事务

任何帮助

Answer 1

尝试：

UPDATE
    TRANSACTION
SET
    points = 0
WHERE
   TransactionID IN (
       SELECT 
           TransactionID
       FROM
           trans_products
       GROUP BY
           TransactionID
       HAVING
           COUNT(*) = 1
   )

编辑：根据您需要添加 ProductID 的评论，您不能有WHEREafterHAVING子句。这就是你需要的：

UPDATE
    TRANSACTION
SET
    points = 0
WHERE
   TransactionID IN (
       SELECT 
           TransactionID
       FROM
           trans_products
       WHERE
           ProductID = '192'
       GROUP BY
           TransactionID
       HAVING
           COUNT(*) = 1
   )