select class_id, round(avg(score),2) average from students group by class_id;
select class_id, gender,round(avg(score),2) average from students group by class_id,gender;
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时间里的安河桥
select class_id, round(avg(score),2) average from students group by class_id;
select class_id, gender,round(avg(score),2) average from students group by class_id,gender;