//1
-- SELECT * from students;
select class_id,avg(score) average from students group by class_id;
//2
select class_id,gender,avg(score) average from students group by class_id,gender;
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祎带一路
//1
-- SELECT * from students;
select class_id,avg(score) average from students group by class_id;
//2
select class_id,gender,avg(score) average from students group by class_id,gender;