zoukankan      html  css  js  c++  java
  • 48

    请将学生成绩查询出来,并且显示出学生编号、名称、班级、性别、学科名称、是否选修
    select stuNO as 学生编号,stuName as 学生名称,className as 班级名称,stuSex as 性别,couName as 学科名称,xx as 是否选修 from stuMark
    left join stu on stumark.stuid=stu.stuid
    left join cou on stumark.couID=cou.couID
    给五班的学生进行必修课的分科排名
    select stuNO as 学生编号,stuName as 学生名称,className as 班级名称,stuSex as 性别,couName as 学科名称,xx as 是否选修,score as 分数 from stuMark
    left join stu on stumark.stuid=stu.stuid
    left join cou on stumark.couID=cou.couID where className=‘五班’ and xx=‘必修’ order by couName, score desc
    选出男生的成绩
    select stuNO as 学生编号,stuName as 学生名称,className as 班级名称,stuSex as 性别,couName as 学科名称,xx as 是否选修,score as 分数 from stuMark
    left join stu on stumark.stuid=stu.stuid
    left join cou on stumark.couID=cou.couID where stusex=‘男’
    每个学生的总分是多少?最高的是谁?
    select stuID as 学生编号,SUM(score) 总分 from stuMark group by stuMark.stuID order by SUM(score)
    每个学生的平均分是多少?最高的是谁?
    select stuID as 学生编号,avg(score) 总分 from stuMark group by stuMark.stuID order by avg(score)
    如果60分是及格分,有学生不及格吗?从成绩找到这名同学
    select stuNO as 学生编号,stuName as 学生名称,className as 班级名称,stuSex as 性别,couName as 学科名称,xx as 是否选修,score as 分数 from stuMark
    left join stu on stumark.stuid=stu.stuid
    left join cou on stumark.couID=cou.couID where score<60
    如果80分是优秀分,找到平均分到达优秀的学生
    select stuID as 学生编号,avg(score) 总分 from stuMark group by stuMark.stuID having avg(score)>80

  • 相关阅读:
    详解jQuery的$符号和init函数
    myeclipse 快捷键,从步骤开始的大括号定位到匹配方法结束的大括号
    为Jquery类和Jquery对象扩展方法
    JQuery 对象和事件
    jquery,禁止冒泡和默认行为
    什么是项目发布
    IP转换成域名
    nslookup域名查询命令查询ip
    Java中的逆变与协变
    iOS 图片背景模糊效果
  • 原文地址:https://www.cnblogs.com/gd11/p/14217191.html
Copyright © 2011-2022 走看看