Use of mysql score table aggregate function

Use of mysql score table aggregate function

Simply use the aggregate function, the actual check like this is wrong

select * from sc

#统计有多人有成绩
select count(score) from sc

#统计最大成绩值
select max(score) from sc

#统计最小成绩值
select min(score) from sc

#统计平均分数
select avg(score) from sc

#求和
select sum(score) from sc