I have been researching and trying various queries to get this to work. What I want to happen is to rank each student based on their average which will be calculated by using AVG(grade) and this will be grouped by student_id. The table with the necessary info is as follows:
assessment_id | student_id | grade | subject_id
What I would like to see after the query is:
student_id | AVG(grade) | rank
I would also like to get the rank of a student using PHP, for example (mysql_query) WHERE student_id = '1001'
The closest I have come to getting this was by using the query below:
SELECT student_id, AVG(grade), (@rn := @rn + 1) AS rank FROM grades CROSS JOIN (SELECT @rn := 0) CONST GROUP BY student_id ORDER BY AVG(grade) DESC
The problem with the query above is that it ranks the students based on their student_id number.
I have searched for solutions all over but they just seem to not solve what I am after. I would really appreciate your help towards this.