mysql - 我的 SQL 语法有什么问题？我在其中使用了 DISTINCT 和 EXCEPT

Question

我想在一种 SQL 语法中使用 DISTINCT、NOT EXISTS 和 EXCEPT，但它不起作用。这是我的 SQL 语法:

        SELECT DISTINCT S.ID, S.name
        FROM student AS S
        WHERE NOT EXISTS(   
            (SELECT course_id FROM course 
            WHERE dept_name = 'Biology')
            EXCEPT
            (SELECT T.course_id FROM takes AS T
            WHERE S.ID = T.ID)
        );

这是错误:

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near 
'EXCEPT (SELECT T.course_id FROM takes AS T WHERE S.ID = T.ID))' at line 1

如何让它工作，我无法解决，大伙帮帮我..

Answer 1

据我所知，MySQL 中没有EXCEPT。使用 NOT IN 而不是

    SELECT DISTINCT S.ID, S.name
    FROM student AS S
    WHERE NOT EXISTS(   
        SELECT course_id FROM course 
        WHERE dept_name = 'Biology' 
        AND course_id NOT IN 
        (SELECT T.course_id FROM takes AS T
        WHERE S.ID = T.ID)
    );