diff --git "a/35 \345\274\240\344\277\212\350\261\252/20230305 \344\275\234\344\270\232.md" "b/35 \345\274\240\344\277\212\350\261\252/20230305 \344\275\234\344\270\232.md"
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+```mysql
+
+show databases;
+create database mxdx charset utf8;
+use mxdx;
+create database sb charset utf8;
+use sb;
+create table student(
+sno varchar(20) not null,
+sname varchar(20) not null,
+ssex varchar(20) not null,
+sbirthday datetime,
+class varchar(20)
+);
+
+create table course(
+cno varchar(20) not null,
+cname varchar(20) not null,
+tno varchar(20) not null
+);
+
+alter table course add foreign key(tno) references teacher(tno);
+
+create table score(
+sno varchar(20) not null,
+cno varchar(20) not null,
+degree decimal(4,1)
+);
+
+create table teacher(
+tno varchar(20) not null primary key,
+tname varchar(20) not null,
+tsex varchar(20) not null,
+tbirthday datetime,
+prof varchar(20),
+depart varchar(20) not null
+);
+
+insert into student values
+(108,'曾华','男','1977-9-1',95033),
+(105,'匡明','男','1975-10-2',95031),
+(107,'王丽','女','1976-1-23',95033),
+(101,'李军','男','1976-2-20',95033),
+(109,'王芳','女','1975-2-10',95031),
+(103,'陆军','男','1974-6-3',95031);
+
+insert into course values
+(3-105,'计算机导论',825),
+(3-245,'操作系统',804),
+(6-166,'数字电路',856),
+(9-888,'高等数学',831);
+
+
+                         primary key (Sno,Cno),
+                         key Cno (Cno),
+                         CONSTRAINT Cno FOREIGN KEY (Cno) REFERENCES course (Cno),
+                         CONSTRAINT Sno FOREIGN KEY (Sno) REFERENCES student (Sno)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+insert into Score values
+                      ('103','3-245','86'),
+                      ('105','3-245','75'),
+                      ('109','3-245','68'),
+                      ('103','3-105','92'),
+                      ('105','3-105','88'),
+                      ('109','3-105','76'),
+                      ('101','3-105','64'),
+                      ('107','3-105','91'),
+                      ('108','3-105','78'),
+                      ('101','6-166','85'),
+                      ('107','6-166','79'),
+                      ('108','6-166','81');
+                      
+create table Teacher( 
+Tno varchar(20) not null primary key ,
+Tname varchar(20) not null ,
+Tsex varchar(20) not null ,
+Tbirthday datetime,
+Prof varchar(20),
+Depart varchar(20)
+                       
+);
+insert into Teacher values
+('804','李诚','男','1958-12-2','副教授','计算机系'),
+('856','张旭','男','1969-3-12','讲师','电子工程系'),
+('825','王萍','女','1972-5-5','助教','计算机系'),
+('831','刘冰','女','1977-8-14','助教','电子工程系');                      
+-- 4.	查询
+-- ①　查询Score表中的最高分的学生学号和课程号。
+select max(degree) sno, cno from score;
+-- ②　查询所有学生的Sname、Cno和Degree列。
+select sname 姓名,cno,degree  from student, score;
+-- ③　查询所有学生的Sno、Cname和Degree列。
+select sno,cname,degree  from course,score;
+-- ④　查询所有学生的Sname、Cname和Degree列。
+select sname 姓名,cname,degree  from course,score,student;
+-- ⑤　查询“95033”班学生的平均分。
+select avg(degree) from student,score where class=95033;
+-- ⑥　查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。
+select * from score where cno='3-105' and degree>76;
+-- ⑦　查询score中选学多门课程的同学中分数为非最高分成绩的记录。
+(select max(degree) from score);
+select degree from score where degree != (select max(degree) from score)group by Degree;
+-- ⑧　查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。
+select * from student s,score se where s.Sno=se.Sno and degree>  (select degree from score where sno='109' and cno='3-105');
+-- ⑨　查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列。
+select year(sbirthday) from student where sno='108';
+select sno ,sname,sbirthday from student where year(sbirthday)=(select year(sbirthday) from student where sno='108');
+-- ⑩　查询“张旭“教师任课的学生成绩。
+select * from teacher where Tname='张旭';
+select degree from teacher t ,course c ,score s where t.tno=c.Tno and c.cno=s.cno and t.tname='张旭';
+-- 11　查询选修某课程的同学人数多于5人的教师姓名。
+select s.cno from teacher t ,course c ,score s where t.tno=c.Tno and c.cno=s.cno group by c.cno having count(s.Cno)>5;
+-- 12　查询出“计算机系“教师所教课程的成绩表。
+select tname ,prof from teacher where depart='计算机系'
+union
+select tname ,prof from teacher where depart='电子工程系';
+-- 13　查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。
+select degree from score where cno='3-245';
+select * from score where Cno='3-105' and degree >= all (select degree from score where cno='3-245') order by degree desc ;
+-- 14　查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。
+select * from score where cno='3-105' and degree > all (select degree from score where cno='3-245');
+-- 16　查询成绩比该课程平均成绩低的同学的成绩表。
+select avg(degree) from score;
+select degree from score where degree< (select avg(degree) from score);
+
+-- 17　查询所有任课教师的Tname和Depart.
+select tname,depart from teacher;
+-- 18　查询所有未讲课的教师的Tname和Depart.
+select tname,depart from teacher left join course c on teacher.tno = c.tno left join score s on c.cno = s.cno where sno is null ;
+
+-- 19　查询“男”教师及其所上的课程。
+select t.*,c.cname from teacher t ,course c where t.tno= c.tno and t.tsex='男';
+-- 20　查询最高分同学的Sno、Cno和Degree列。
+select * from score where degree=(select max(fegree) from score);
+-- 21　查询和“李军”同性别的所有同学的Sname.
+select sname from student where ssex= (select ssex from student where sname='李军');
+-- 22　查询和“李军”同性别并同班的同学Sname.
+select sname from student where ssex= (select ssex from student where sname='李军') and class=(select class from student where sname='李军');
+
+-- 23　查询所有选修“计算机导论”课程的“男”同学的成绩表
+select ssex,cname,degree from student s,course c,score se where s.sno=se.sno and se.cno=c.cno and cname='计算机导论' and ssex='男';
+```
+
diff --git "a/35 \345\274\240\344\277\212\350\261\252/20230306\344\275\234\344\270\232.txt" "b/35 \345\274\240\344\277\212\350\261\252/20230306\344\275\234\344\270\232.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..16f0f9f877dd803db8224b946a03561bb3a80152
--- /dev/null
+++ "b/35 \345\274\240\344\277\212\350\261\252/20230306\344\275\234\344\270\232.txt"	
@@ -0,0 +1,88 @@
+create database sb charset utf8;
+use sb
+
+create table stuinfo(
+stuno varchar(20) primary key,
+stuname varchar(20),
+stusex varchar(10),
+stuage int(10),
+stuaddress varchar(20),
+stuseat int(10)
+);
+
+drop table stuinfo;
+drop table stuexam;
+drop table stumarks;
+
+create table stuexam(
+examno int(10) primary key auto_increment,
+stuno varchar(20),
+writtenexam int(20),
+labexam int(20)
+);
+
+create table stumarks(
+examno int(10) primary key auto_increment,
+stuid varchar(20),
+score int(10)
+);
+
+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',,'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,'s2502',92),
+(3,'s2503',53),
+(4,'s2504',60),
+(5,'s2505',99),
+(6,'s2506',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 z.stuno,z.stuname,z.stusex,max(score) from stuinfo z inner join stumarks j on z.stuno = j.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 z.stuno,z.stuname,z.stusex,((j.writtenexam + j.labexam)/2)考试平均分 from stuinfo z left join stuexam j on z.stuno = j.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 stuage >= 20 and stusex = '男';
+-- 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 z.* from stuinfo z,(select stuid from stumarks group by stuid having min(score) >= 60) j where z.stuno = j.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 z.* from stuinfo z,(select stuid from stumarks group by stuid) j where a.stuno =j.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 z.* from stuinfo z,(select stuid from stumarks group by stuid having max(score) > 90) j where z.stuno = j.stuid; 
+-- 10.查询出平均成绩在80分以上的学生的基本信息（stuMarks）
+select z.* from stuinfo z,(select stuid from stumarks group by stuid having avg(score) > 80) j where z.stuno = j.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 z.* from stuinfo z,(select stuid from stumarks where stuid != '2501' group by stuid having max(score) > (select max(score) from stumarks where stuid != '2501')) j where z.stuno = j.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 * from stuinfo z, (select stuid from stumarks where stuid != '2501'group by stuid having max(score) > (select min(score) from stumarks where stuid != '2501')) j where z.stuno =j.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');
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