WITH ClassScores AS
(
SELECT 1 AS class, 'Anna' AS name, 34 AS score
UNION
SELECT 1, 'Andy', 80
UNION
SELECT 2, 'Brooke', 90
UNION
SELECT 2, 'Brad', 70
UNION
SELECT 3, 'Charles', 67
UNION
SELECT 3, 'Christina', 66
)
SELECT C1.Class, C1.Name, C1.Score
FROM ClassScores AS C1
JOIN (SELECT Class, MAX(Score) AS MaxScore
FROM ClassScores
GROUP BY Class
) AS C2
ON C1.Class = C2.Class
AND C1.Score = C2.MaxScore
ORDER BY C1.Class;