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View gist:6320577
SELECT name, subject, grade FROM
(SELECT student_id, subject_id, grade, RANK() OVER (PARTITION BY student_id ORDER BY grade)
FROM exams)
AS grades, students, subjects
WHERE grades.subject_id = subjects.subject_id AND grades.student_id = students.student_id
AND rank = 1 ORDER BY grade;
View gist:6320512
SELECT name, subject, grade FROM
(SELECT, subjects.subject, grade, RANK() over (PARTITION BY students.student_id ORDER BY grade) rank
FROM exams, students, subjects
WHERE exams.subject_id = subjects.subject_id AND exams.student_id = students.student_id) AS grades
WHERE rank = 1;