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select sname,ssex,class from t_hq_student;

select distinct depart from t_hq_teacher;

select * from t_hq_student;

select * from t_hq_score where degree between 60 and 80;

select * from t_hq_score where degree in (‘85‘,‘86‘,‘88‘);

select * from t_hq_student where class like‘95031‘ or ssex like ‘女‘;

select * from t_hq_student order by class desc;

select * from t_hq_score order by cno;

select * from t_hq_score order by degree desc;

select class, count(1) as 人数 from t_hq_student where class =‘95031‘ group by class;

select * from t_hq_score where  degree >= all(select degree from t_hq_score);

select cno,avg(degree) as 平均成绩 from t_hq_score group by cno;

select sno from t_hq_score where degree > 70 and degree < 90;