SELECT AVG(score) avg_score, class_id FROM students GROUP BY class_id;
SELECT AVG(score) avg_score, class_id, gender FROM students GROUP BY class_id, gender;
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Krien-jac
SELECT AVG(score) avg_score, class_id FROM students GROUP BY class_id;
SELECT AVG(score) avg_score, class_id, gender FROM students GROUP BY class_id, gender;