diff --git "a/47 \345\217\262\345\255\246\346\226\260/20230309 \344\275\234\344\270\232.md" "b/47 \345\217\262\345\255\246\346\226\260/20230309 \344\275\234\344\270\232.md"
new file mode 100644
index 0000000000000000000000000000000000000000..90e604269136ff59ffcb73caf65868528b033dfd
--- /dev/null
+++ "b/47 \345\217\262\345\255\246\346\226\260/20230309 \344\275\234\344\270\232.md"	
@@ -0,0 +1,118 @@
+```mysql
+create database `0309` charset utf8;
+
+use `0309`;
+
+create table stuinfo(
+	stuno varchar(20) primary key,
+	stuname varchar(20),
+	stuage int,
+	stuaddress varchar(50),
+	stuseat int,
+	stusex int
+);
+
+create table stuexam(
+	examno int primary key,
+	stuno varchar(20),
+	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',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 姓名,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,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,writtenexam,labexam,(writtenexam+labexam) 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 distinct stuage 年龄 from stuinfo;
+
+-- 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;
+
+-- 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;
+
+-- 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 labexam desc;
+
+-- 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 where stuage 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,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,stuno,writtenexam,labexam from stuexam where writtenexam in (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,stuno,writtenexam,labexam from stuexam where labexam in (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 stusex,avg(stuage),sum(stuage) from stuinfo group by stusex;
+
+```
+