Question

我已经在这个问题上工作了几天，并在论坛后搜索了论坛。我已经提出了相同的答案来格式化这个问题但我继续得到同样的问题。我希望有人可以提供帮助。我在这段代码上收到错误＃1064。我知道这与调用学生表有关，我无法解决错误。

UPDATE
  s 
SET
  tot_cred = u.real_cred 
FROM
  student s
  JOIN (
    SELECT ID, SUM( credits ) real_cred
    FROM takes t
    JOIN course c ON t.course_id = c.course_id
    WHERE grade <>  'F'
    AND grade IS NOT NULL 
    GROUP BY ID
  ) u ON s.ID = u.ID

Answer 1

您正在使用SQL Server的加入语法更新，此处为MySQL：

UPDATE  student s 
        INNER JOIN 
        (
            SELECT  ID,     SUM( credits ) real_cred
            FROM    takes t
                    INNER JOIN course c 
                        ON t.course_id = c.course_id
            WHERE   grade <>  'F' AND 
                    grade IS NOT NULL 
            GROUP   BY ID
        ) u ON s.ID = u.ID
SET     s. tot_cred = u.real_cred

尝试使用另一个表中的总和更新表时MYSQL错误＃1064

1 个答案: