我们如何加入这些student_info和class_info表,没有公共列,但两个外键都存储在class_student表中。
答案 0 :(得分:0)
调整以适合您的WHERE子句,特定数据库和JOIN需求。
对于学生的课程:
SELECT *
FROM student_info JOIN class_student ON student_info.student_id = class_student.student_id
JOIN class_info ON class_student.class_id = class_info.class_id
WHERE student_info.student_id = ...
对于班级的学生:
SELECT *
FROM class_info JOIN class_student ON class_info.class_id = class_student.class_id
JOIN student_info ON class_student.student_id = student_info.student_id
WHERE class_info.class_id = ...