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1.查询Java课程的学生姓名和学号
select stu.no,stu.name
from
table_student stu
inner join table_sc sc on sc.no = stu.no
inner join table_course cou on sc.number = cou.number
where upper(cou.coursename) = 'JAVA'
2.依依的选修课名称
select cou.coursename
from
table_course cou
inner join table_student stu on stu.number = stu.number
3.选修5门课的学生
select stu.no,stu.name
from
table_student stu
inner join (select score.no,count(score.no) noCount from table_sc score GROUP BY score.no ) tempSc on tempSc.no = stu.no
where tempSc.noCount=5
4.分页查询1-5
SELECT stu.*
FROM table_student stu
LIMIT 0,5
5.成绩排序，五页一条，查第二页
SELECT sc.*
FROM table_sc sc
Order by sc.chengJi
LIMIT 5,5
6.每个班级成绩最好的学生姓名和成绩
select stu.no,stu.name
from
table_student stu
where stu.no in (select sc.no from table_sc sc where sc.chengJi = Max(sc.chengJi) GROUP BY score.number)
7.取出当前时间
SELECT DATE_FORMAT(NOW(),'%Y%m%d%H%i%s')