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+```sql
+
+```
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+```sql
+CREATE DATABASE td charset utf8;
+use td;
+CREATE  table stuinfo(
+stuNO VARCHAR(10) primary key,
+stuName VARCHAR(10),
+stuSex  VARCHAR(10),
+stuAge VARCHAR(10),
+stuAddress VARCHAR(20),
+stuSeat INT
+);
+CREATE table stuExam(
+examNo int primary key auto_increment,
+stuNO VARCHAR(10),
+writtenExam int,
+labExam INT
+);
+CREATE table stuMarks(
+examNo int primary key auto_increment,
+stuID VARCHAR(10),
+score INT
+);
+alter table stuExam add foreign key (stuNO) references stuinfo(stuNO);
+alter table stuMarks add foreign key (examNo) references stuExam(examNo);
+
+
+INSERT into stuinfo VALUES
+('s2501','张秋利','男',20,'美国硅谷',1),
+('s2502','李斯文','女',18,'湖北武汉',2),
+('s2503','马文才','男',18,'湖南长沙',3),
+('s2504','欧阳俊雄','女',21,'湖北武汉',4),
+('s2505','梅超风','男',20,'湖北武汉',5),
+('s2506','陈旋风','男',19,'美国硅谷',6);
+
+INSERT INTO stuExam VALUES
+(1,'s2501',50,70),
+(2,'s2502',60,65),
+(3,'s2503',86,70),
+(4,'s2504',40,80),
+(5,'s2505',70,85),
+(6,'s2506',85,90);
+
+INSERT into stuMarks VALUES
+(1,'s2501',88),
+(2,'s2501',92),
+(3,'s2501',53),
+(4,'s2502',60),
+(5,'s2502',99),
+(6,'s2503',82);
+
+
+# 1.查询出年龄比班上平均年龄大的学生的信息
+select * from stuinfo where stuAge>(select avg(stuAge) from stuinfo);
+
+# 2.查询出每个学生的学号，姓名，性别和选修课程的最高分（stuMarks）
+select a.stuNO,a.stuName,a.stuSex,max(score) from stuinfo a left join stumarks b on a.stuNO=b.stuID group by stuNO;
+
+# 3.查询出每个学生的学号，姓名，性别和考试平均分（stuExam）
+select a.stuNO,a.stuName,a.stuSex,(b.writtenExam+b.labExam)/2 平均分 from stuinfo a left join stuexam b on a.stuNO=b.stuNO;
+
+# 4.查询性别是男并且年龄大于等于20的学生的信息(用两种方法实现：普通查询和子查询)
+select * from stuinfo where stuSex='男' and stuAge>=20;
+
+# 5.查询出年龄比所有男生年龄都大的女生的信息
+select * from stuinfo where stuSex='女' and stuAge>(select max(stuAge) from stuinfo where stuSex='男');
+
+# 6.查询出所有选修课程都及格的学生的信息   （stuMarks）
+select a.* from stuinfo a, (select stuID from stumarks group by stuID having min(score)>=60) b where a.stuNO=b.stuID;
+
+# 7.查询出参加考试的学生的信息（用表连接，in二种方法做）（stuMarks）
+select a.* from stuinfo a,(select stuID from stumarks group by stuID) b where a.stuNO=b.stuID;
+
+# 8.查询出没有参加考试的学生的信息（用表连接，in二种方法做）（stuMarks）
+select * from stuinfo where stuNO not in(select stuID from stumarks group by stuID);
+
+# 9.将有一门成绩成绩大于90分的学生的基本信息查询出来（stuMarks）
+select a.* from stuinfo a,(select stuID from stumarks group by stuID having max(score)>90) b where a.stuNO=b.stuID;
+
+# 10.查询出平均成绩在80分以上的学生的基本信息（stuMarks）
+select a.* from stuinfo a,(select stuID from stumarks group by stuID having avg(score)>80) b where a.stuNO=b.stuID;
+
+# 11.查询出某同学所有考试成绩比“张秋利”同学所有分数都高的学生基本信息（stuMarks）
+select a.* from
+stuinfo a,
+(select stuID from stumarks where stuID!='s2501' group by stuID having max(score)>(select max(score) from stumarks where stuID='s2501')) b
+where
+    a.stuNO=b.stuID;
+
+# 12.查询出某同学所有考试成绩只需要比“张秋利”同学某个分数高的学生基本信息（stuMarks）
+select a.* from
+stuinfo a,
+(select stuID from stumarks where stuID!='s2501' group by stuID having max(score)>(select min(score) from stumarks where stuID='s2501')) b
+where
+    a.stuNO=b.stuID;
+
+# 13.查询班上比所有男生年龄都要大的女生的信息
+select * from stuinfo where stuSex='女' and stuAge>(select max(stuAge) from stuinfo where stuSex='男');
+
+# 14.查询出只是比某个男生年龄大的女生的信息
+select * from stuinfo where stuSex='女' and stuAge>(select min(stuAge) from stuinfo where stuSex='男');
+
+
+```