Inner Join Table (Mapping table)
SELECT 
                 students.ID as 'StudentID',
                 course.ID as 'CourseID', 
                 students.name,
                 course.course_name, 
                 course.cost_fee, 
                 students_Course.net_cost
        FROM      
                 students_course INNER JOIN  students on students.ID     = students_course.students_ID
                 inner join course on course_ID = students_course.course_ID
        where 
                 course.ID = cos_ID;