mysql经典题】6、查询学过「张三」老师授课的同学的信息

SELECT stu.*
FROM student stu
    JOIN sc s ON stu.sno = s.sno
WHERE s.cno IN (
    SELECT cno
    FROM course
    WHERE course.tno = (
        SELECT tno
        FROM teacher
        WHERE teacher.tname = '张三'
    )
);

先查出上了张三老师的课的学生的编号。然后在用子链接查询学生的信息。