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+# 作业
+
+```mysql
+create database xuesen charset utf8;
+
+use xuesen;
+
+create table stuinfo (
+stuNO varchar(100),
+stuName varchar(100),
+stuAge varchar(100),
+stuAddress varchar(100),
+stuSeat varchar(100),
+stuSex varchar(100)
+);
+
+create table stuexam(
+examNO varchar(100),
+stuNO varchar(100),
+writtenExam varchar(100),
+labExam varchar(100)
+);
+
+insert into stuinfo values 
+('s2501','张秋利','20','美国硅谷','1','1'),
+('s2502','李斯文','18','湖北武汉','2','0'),
+('s2503','马文才','22','湖南长沙','3','1'),
+('s2504','欧阳俊雄','21','湖北武汉','4','0'),
+('s2505','梅超风','20','湖北武汉','5','1'),
+('s2506','陈旋风','19','美国硅谷','6','1'),
+('s2507','陈风','20','美国硅谷','7','0');
+
+insert into stuexam values 
+('1','s2501','50','70'),
+('2','s2502','60','65'),
+('3','s2503','86','85'),
+('4','s2504','40','80'),
+('5','s2505','70','90'),
+('6','s2506','85','90');
+
+-- 按图片所给的数据进行数据表的建立和数据插入，然后进行以下查询操作
+-- 
+-- 1.查询学生信息表（stuinfo）中所有列信息，给每列取上中文名称
+
+select stuNO 学号,stuName 名字, stuAge 年龄,stuAddress 地址,stuSeat 座位号,stuSex 性别 from stuinfo;
+
+-- 
+-- 2.查询学生信息表（stuinfo）中的姓名，年龄和地址三列的信息
+-- 
+
+select stuName,stuAge,stuAddress from stuinfo;
+
+-- 3.查询学生分数表（stuexam）中的学号，笔试和机试三列的信息，并为这三列取中文名字
+-- 
+
+select stuNO 学号,writtenExam 笔试分,labExam 机试分 from stuexam;
+
+-- 5.查询学生分数表（stuexam）中的学生的学号，笔试，机试以及总分这四列的信息
+
+select stuinfo.stuNO,writtenexam,labexam,(writtenexam + labexam) aug from stuinfo left join stuexam on stuinfo.stuNO=stuexam.stuNO;
+
+-- 
+-- 6.查询学生信息表（stuInfo）中学生来自哪几个地方 
+
+select stuAddress from stuinfo GROUP BY stuAddress;
+
+-- 
+-- 7.查询学生信息表（stuInfo）中学生有哪几种年龄，并为该列取对应的中文列名
+
+select stuAge 年龄 from stuinfo GROUP BY stuage;
+
+-- 
+-- 8.查询学生信息表（stuInfo）中前3行记录 
+
+select * from stuinfo LIMIT 3;
+
+-- 
+-- 9.查询学生信息表（stuInfo）中前4个学生的姓名和座位号
+
+select stuname,stuseat from stuinfo limit 4;
+
+-- 
+-- 11.将地址是湖北武汉，年龄是20的学生的所有信息查询出来
+
+select * from stuinfo where stuaddress='湖北武汉' and stuage = '20';
+
+-- 
+-- 12.将机试成绩在60-80之间的信息查询出来，并按照机试成绩降序排列
+
+select labexam from stuexam where labexam between 60 and 80 order by labexam desc;
+
+-- 
+-- 13.查询来自湖北武汉或者湖南长沙的学生的所有信息
+
+select * from stuinfo where stuaddress='湖北武汉' or stuaddress='湖南长沙';
+
+-- 
+-- 14.查询出笔试成绩不在70-90之间的信息,并按照笔试成绩升序排列
+
+select writtenexam from stuexam where writtenexam not between 70 and 90 order by writtenexam;
+
+-- 
+-- 15.查询年龄没有写的学生所有信息
+
+select * from stuinfo where stuage is null;
+
+-- 
+-- 16.查询年龄写了的学生所有信息
+
+select * from stuinfo where stuage  is not null;
+
+-- 
+-- 17.查询姓张的学生信息
+
+select * from stuinfo where stuname like '张%';
+
+-- 
+-- 18.查询学生地址中有‘湖’字的信息
+
+select * from stuinfo where stuaddress like '%湖%';
+
+-- 
+-- 19.查询姓张但名为一个字的学生信息
+
+select * from stuinfo where stuname like '张_';
+
+-- 
+-- 20.查询姓名中第三个字为‘俊’的学生的信息，‘俊’后面有多少个字不限制
+-- 
+
+select * from stuinfo where stuname like '__俊%';
+
+-- 21.按学生的年龄降序显示所有学生信息
+
+select * from stuinfo order by stuage desc;
+
+-- 
+-- 22.按学生的年龄降序和座位号升序来显示所有学生的信息
+
+select * from stuinfo order by stuage desc,stuseat;
+
+-- 
+-- 23显示笔试第一名的学生的考试号，学号，笔试成绩和机试成绩
+
+select * from stuexam where writtenexam = (select max(writtenexam) from stuexam);
+
+
+
+-- 
+-- 24.显示机试倒数第一名的学生的考试号，学号，笔试成绩和机试成绩
+
+select * from stuexam where labexam = (select min(labexam) from stuexam);
+
+-- 
+-- 25.查询每个地方的学生的平均年龄
+
+select stuaddress,avg(stuage) from stuinfo GROUP BY stuaddress;
+
+-- 
+-- 26.查询男女生的分别的年龄总和
+
+select stusex,sum(stuage) from stuinfo GROUP BY stusex;
+
+-- 
+-- 27.查询每个地方的男女生的平均年龄和年龄的总和
+
+select stuaddress,stusex,avg(stuage),sum(stuage) from stuinfo GROUP BY stuaddress,stusex;
+
+-- 
+-- 
+-- 
+
+
+
+
+
+
+
+
+```
+