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+```
+create database studen charset utf8;
+use studen;
+create table stuinfo(
+	stuNO varchar(11) primary key,
+	stuName varchar(11) unique key not null,
+	stuAge int not null,
+	stuAddress varchar(11) not null,
+	stuSeat int not null,
+	stuSex int not null
+);
+create table stuexam(
+	examNO int not null unique key auto_increment,
+	stuNO varchar(11) primary key,
+	writtenExam int not null,
+	labExam int not null,
+	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',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);
+```
+
+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 姓名,stuAge 年龄,stuAddress 地址,stuSeat 号数,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 姓名,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 distinct stuAddress from stuinfo;
+```
+
+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 0,3;
+```
+
+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 0,4;
+```
+
+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 asc;
+```
+
+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 asc;
+```
+
+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 examNO,a.stuNO,writtenExam,labExam from stuinfo a right join stuexam b on a.stuno=b.stuNO 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 examNO,a.stuNO,writtenExam,labExam from stuinfo a right join stuexam b on a.stuno=b.stuNO where labExam=(select min(labExam) from stuexam);
+```
+
+25.查询每个地方的学生的平均年龄
+
+```
+select stuAddress,round(avg(stuAge),2) 平均年龄 from stuinfo group by stuAddress;
+```
+
+26.查询男女生的分别的年龄总和
+
+```
+select stuSex,sum(stuAge) 年龄总和 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 stuSex,round(avg(stuAge),2) 平均年龄,sum(stuAge) 年龄总和 from stuinfo group by stuSex;
+```
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