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CREATE TABLE scores ( id INTEGER, score INTEGER, grade INTEGER ); INSERT INTO scores (id, score, grade) VALUES ('1', '48', '1'), ('2', '56', '2'), ('3', '69', '1'), ('4', '35', '1'), ('5', '78', '2'), ('6', '90', '2'), ('7', '87', '2'), ('8', '33', '1');
8 rows affected
select s.* from scores s inner join ( select grade, max(score) as score from scores group by grade ) sg on s.grade = sg.grade and s.score = sg.score;
id
score
grade
3
69
1
6
90
2