mysql> drop view if exists v_student;
mysql> select * from score;
mysql> select * from student limit 2,4；
mysql> select * from student
-> where department='英语系' or department='中文系';
mysql> select count(1) from student
-> group by department;
mysql> select max(grade),c_name '最高分' from score
-> group by c_name;
mysql> select c_name,grade from student join score on student.id=score.stu_id
-> where name='李广昌';
mysql> select student.*,score.* from student join score on student.id
-> =score.stu_id;
mysql> select name,sum(grade) '总成绩' from student join score on student.id=score.stu_id
-> group by name;
mysql> select department,round(avg(grade),2) '总成绩' from student join score on student.id=
score.stu_id
-> group by department;
mysql> select student.*,c_name,grade from student join score on student.id=
-> score.stu_id
-> where c_name='计算机' and grade<95;
mysql> select student.*,c_name,grade from student join score on student.id=
-> score.stu_id
-> where c_name='计算机'
-> order by grade desc;
mysql> select id from student union select stu_id from score;
mysql> select name,department,c_name,grade from student join score on student.id=score.stu_id
-> where name like '张%' or name like '王%';
mysql> select name,year(now())-birth '年龄',c_name,grade from student join score on student.
id=score.stu_id
-> where address like '湖南%';
