How to get max value with 3 inner joins?

Question

Need help with getting the max value for Grade with inner joins.

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Code:

SELECT StudFirstName, StudLastName, sc.ClassID, sub.SubjectID, sub.CategoryID, Grade
FROM SS_Students as st INNER JOIN SS_Student_Schedules as ss
ON st.StudentID = ss.StudentID
INNER JOIN SS_Classes as sc
ON ss.ClassID = sc.ClassID
INNER JOIN SS_Subjects as sub
ON sc.SubjectID = sub.SubjectID;

Just need to get the max value for Grade so the output will shorten down to 1 row.

Answer 1

You should use group by and max like:

SELECT StudFirstName, StudLastName, sc.ClassID, sub.SubjectID, sub.CategoryID, MAX(Grade)
FROM SS_Students as st INNER JOIN SS_Student_Schedules as ss
    ON st.StudentID = ss.StudentID
INNER JOIN SS_Classes as sc
    ON ss.ClassID = sc.ClassID
INNER JOIN SS_Subjects as sub
    ON sc.SubjectID = sub.SubjectID
GROUP BY StudFirstName, StudLastName, sc.ClassID, sub.SubjectID, sub.CategoryID

This will give you the student list and max grade for each student.