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+```sql
+create database class1 charset utf8;
+use class1;
+create table stuinfo(
+	stuNO char(5) primary key, 
+	stuName varchar(4),
+	stuAge int,
+	stuAddress varchar(4),
+	stuSeat int unique not null auto_increment ,
+	STUSEX enum("1","0")
+);
+
+create table stuExam(
+examNO int PRIMARY key,
+stuNO char(5),
+writtenExam int ,
+labExam int,
+foreign key(stuNO) references stuinfo(stuNO)
+);
+
+
+
+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',18,'湖南长沙',3,"1"),
+('s2504','欧阳俊熊',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 序号,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 名字, stuage 年龄,stuaddress 地址 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,labexam 机试 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 stuno 学号, writtenexam 笔试,labexam 机试, writtenexam+labexam 总分 from stuexam;
+-- 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 where stuseat<=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 where stuseat<=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 * 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 * 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,count(stusex) 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(stusex) from stuinfo group by stuaddress,stusex;
+
+
+
+```
+