mysql语句为：
select * from student order by subject desc limit 10; 查询总分成绩前十：mysql语句为：
select sum(subject) subject,name from student group by name order by subject desc limit 10; 注： select sum(subject) subject,name 这句的意思是：sum(subject) subject 把单科成绩加总用subject 来命名（就是总成绩），name就是一个字段，这里只有两个字段。 group by name order by subject ： group by name 的意思按照名字这一栏来分组，当然，学生成绩表名字有可能是一样的，按照学号是最准确的，这里只是举个例子。
order by subject 这句的意思是按照总分成绩排序，这里的subject 是前面重命名总分的意思。
select sum(subject) as countsubject,name from student group by name order by countsubject desc limit 10;
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