diff --git "a/13 \346\264\252\347\201\277\350\212\263/\344\275\234\344\270\232/8.29 day1\344\275\234\344\270\232.md" "b/13 \346\264\252\347\201\277\350\212\263/\344\275\234\344\270\232/8.29 day1\344\275\234\344\270\232.md"
deleted file mode 100644
index 53287ad92ea15328101b987271a6c1f2d56a6909..0000000000000000000000000000000000000000
--- "a/13 \346\264\252\347\201\277\350\212\263/\344\275\234\344\270\232/8.29 day1\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,54 +0,0 @@
-# 8.29 day1作业
-
-```sql
-create database DBTEST
-go
-use DBTEST
-go
-create table sectionInfo(
-	sectionID  int primary key identity(1,1),
-	sectionName  varchar(10) not null
-)
-go
-create table userinfo(
-	userNo  int primary key identity(1,1),
-	userName  varchar(10) unique not null check(len(userName)>4),
-	userSex   varchar(2) not null check(userSex='男'or userSex='女'),
-	userAge   int not null check(userAge>1 and userAge<=100),
-	userAddress  varchar(50) default('湖北'),
-	userSection  int references sectionInfo(sectionID)
-)
-go
-create table workInfo(
-	workId int identity(1,1) primary key not null,
-	userId  int references userinfo(userNo) not null,
-	workTime datetime not null,
-	workDescription  varchar(40) check(workDescription='迟到' or workDescription='早退' or workDescription='旷工'or workDescription='病假' or workDescription='事假')
-)
-go
-insert sectionInfo values
-	('营销部'),
-	('市场部'),
-	('销售部'),
-	('开发部'),
-	('售后部')
-go
-insert userinfo values
-	('aaaaa','女',20,'江西','1'),
-	('bbbbb','女',20,'江西','1'),
-	('ccccc','女',20,'江西','1'),
-	('ddddd','女',20,'江西','1'),
-	('eeeee','女',20,'江西','1')
-go
-insert workInfo values
-	(13,'2022/2/2','迟到'),
-	(14,'2022/2/2','迟到'),
-	(15,'2022/2/2','迟到'),
-	(16,'2022/2/2','迟到'),
-	(17,'2022/2/2','迟到')
-
-select * from sectionInfo
-select * from userinfo
-select * from workInfo
-```
-
diff --git "a/13 \346\264\252\347\201\277\350\212\263/\344\275\234\344\270\232/8.30 day2 \344\275\234\344\270\232.md" "b/13 \346\264\252\347\201\277\350\212\263/\344\275\234\344\270\232/8.30 day2 \344\275\234\344\270\232.md"
deleted file mode 100644
index 1883762e8c0515a5510e2023b48278377a629a11..0000000000000000000000000000000000000000
--- "a/13 \346\264\252\347\201\277\350\212\263/\344\275\234\344\270\232/8.30 day2 \344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,78 +0,0 @@
-# 8.30 day2 作业
-
-```sql
---1. 查询所有行所有列
-select * from People
---2. 指定列查询（姓名，性别，月薪，电话）
-select PeopleName,PeopleSex,PeopleSalary,PeoplePhone from People
---3. 指定列查询,并自定义中文列名（姓名，性别，月薪，电话）
-select PeopleName 姓名,PeopleSex 性别,PeopleSalary 月薪,PeoplePhone 电话 from People
---4. 查询公司员工所在城市（不需要重复数据）
-select distinct PeopleAddress from People
---5. 假设工资普调10%，查询原始工资和调整后的工资，显示（姓名，性别，月薪，加薪后的月薪）（添加列查询）。
-select PeopleName,PeopleSex,PeopleSalary,PeopleSalary*1.1 调整后 from People
---1. 根据指定列（姓名，性别，月薪，电话）查询性别为女的员工信息,并自定义中文列名
-select PeopleName,PeopleSex,PeopleSalary,PeoplePhone from People
-where PeopleSex='女'
---2. 查询月薪大于等于10000 的员工信息( 单条件 )
-select PeopleName,PeopleSex,PeopleSalary,PeoplePhone from People
-where PeopleSalary >10000
---3. 查询月薪大于等于10000 的女员工信息(多条件)
-select PeopleName,PeopleSex,PeopleSalary,PeoplePhone from People
-where PeopleSex='女' and PeopleSalary >10000
---4. 显示出出身年月在1980-1-1之后，而且月薪大于等于10000的女员工信息。
-select * from People
-where PeopleSex='女' and PeopleSalary >10000 and PeopleBirth>1980-1-1
---5. 显示出月薪大于等于15000 的员工,或者月薪大于等于8000的女员工信息。
-select * from People where PeopleSalary >= 15000 or PeopleSalary >8000 and PeopleSex='女' 
---6. 查询月薪在10000-20000 之间员工信息( 多条件 )
-select * from people where PeopleSalary >=10000 and PeopleSalary <= 20000
---7. 查询出地址在北京或者上海的员工信息
-select * from People where PeopleAddress ='北京' or PeopleAddress='上海'
---8. 查询所有员工信息(根据工资排序，降序排列)
-select * from People
-order by PeopleSalary desc
---9. 显示所有的员工信息，按照名字的长度进行倒序排列
-select * from People
-order by len(PeopleName) desc
---10. 查询工资最高的5个人的信息
-select top 5 * from People
-order by PeopleSalary desc
---11. 查询工资最高的10%的员工信息
-
---12. 查询出地址没有填写的员工信息
-select * from People where PeopleAddress is null
---13. 查询出地址已经填写的员工信息
-select * from People where PeopleAddress is not null
---14. 查询所有的80后员工信息
-select * from People
-where PeopleBirth>1980-1-1
---15. 查询年龄在30-40 之间，并且工资在15000-30000 之间的员工信息
-select * from people 
-where (YEAR(GETDATE())-YEAR(PeopleBirth)) between 30 and 40
---16. 查询出巨蟹 6.22--7.22 的员工信息
-select * from People where (MONTH(PeopleBirth)=6 and day(PeopleBirth)>=22)or (month(PeopleBirth)=7 and day(PeopleBirth)<=22)
---17. 查询工资比赵云高的人
-select * from People where PeopleSalary > (select PeopleSalary from People where PeopleName = '赵云')
---18. 查询出和赵云在同一个城市的人
-select * from People where PeopleAddress = (select PeopleAddress from People where PeopleName = '赵云')
---19. 查询出生肖为鼠的人员信息
-select * from people where (year(PeopleBirth)%12)-3 =1
---20. 查询所有员工信息，添加一列显示属相(鼠,牛,虎,兔,龙,蛇,马,羊,猴,鸡,狗,猪)
-select *,
-	case
-	when (year(peoplebirth)%12)-3 =1 then '鼠'
-	when (year(peoplebirth)%12)-3 =2 then '牛'
-	when (year(peoplebirth)%12)-3 =3 then '虎'
-	when (year(peoplebirth)%12)-3 =4 then '兔'
-	when (year(peoplebirth)%12)-3 =5 then '龙'
-	when (year(peoplebirth)%12)-3 =6 then '蛇'
-	when (year(peoplebirth)%12)-3 =7 then '马'
-	when (year(peoplebirth)%12)-3 =8 then '羊'
-	when (year(peoplebirth)%12)-3 =9 then '猴'
-	when (year(peoplebirth)%12)-3 =10 then '鸡'
-	when (year(peoplebirth)%12)-3 =11 then '狗'
-	when (year(peoplebirth)%12)-3 =12 then '猪'
-	else '' end 生肖 from People
-```
-
diff --git "a/19\351\231\210\345\277\227\346\242\201/2022-09-04 (2).png" "b/19\351\231\210\345\277\227\346\242\201/2022-09-04 (2).png"
new file mode 100644
index 0000000000000000000000000000000000000000..4f945a4b3d77d275e33209c9da8431e6ad8b746c
Binary files /dev/null and "b/19\351\231\210\345\277\227\346\242\201/2022-09-04 (2).png" differ
diff --git "a/19\351\231\210\345\277\227\346\242\201/2022-09-04 (3).png" "b/19\351\231\210\345\277\227\346\242\201/2022-09-04 (3).png"
new file mode 100644
index 0000000000000000000000000000000000000000..40459f0fb69023efdce812a045c8c72d9a74080a
Binary files /dev/null and "b/19\351\231\210\345\277\227\346\242\201/2022-09-04 (3).png" differ
diff --git "a/19\351\231\210\345\277\227\346\242\201/DBTEST.sql" "b/19\351\231\210\345\277\227\346\242\201/DBTEST.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..d7ed797e53998f8be51c22d842bc73109f5aca9a
--- /dev/null
+++ "b/19\351\231\210\345\277\227\346\242\201/DBTEST.sql"
@@ -0,0 +1,303 @@
+if exists(select * from sys.databases where name='DBTEST')
+drop database DBTEST;
+go
+
+create database DBTEST;
+go
+
+use DBTEST;
+go
+
+--�������ű�
+create table Department 
+(
+	--�������ű��;int������������;primary key��������;identity(1,1)������1��ʼ����Ϊ1������;
+	DepartmentId int primary key identity(1,1),
+	--������������;nvarchar(50)��������50���ַ���;not null��������Ϊ��;
+	DepartmentName nvarchar(50) not null,
+	--��������������text�������ı�;
+	DepartmentRemark text
+);
+go
+
+--����ְ������rankΪϵͳ�ؼ��֣��˴�ʹ��[]�����Զ������֣�����ϵͳ�ؼ���
+create table [Rank]
+(
+	RankId int primary key identity(1,1),
+	RankName nvarchar(50) not null,
+	RankRemark text
+);
+go
+
+--����Ա����Ϣ��
+create table People
+(
+	PeopleId int primary key identity(1,1),
+	--references�����������,���ֶα�������������������Լ��
+	DepartmentId int references Department(DepartmentId)  not null,
+	RankId int references [Rank](RankId) not null,
+	PeopleName nvarchar(50) not null,
+	--default�����ֶ�Ĭ��ֵ; check���Թ涨�ֶ�ֵ��Լ������;
+	PeopleSex nvarchar(1) default('��') check(PeopleSex='��' or PeopleSex='Ů') not null,
+	PeopleBirth datetime not null,
+	PeopleSalary decimal(12,2) check(PeopleSalary>= 1000 and PeopleSalary <= 100000) not null,
+	--unique����ΨһԼ����Ϊ�����ṩΨһ�Ա�֤;
+	PeoplePhone nvarchar(20) unique not null,
+	PeopleAddress nvarchar(100),
+	--datetime��smalldatetime�����Ա�ʾʱ�����ͣ�getdate()���ڻ�ȡϵͳ��ǰʱ��
+	PeopleAddTime smalldatetime default(getdate())
+);
+go
+
+
+
+------------------------------�������ݲ���------------------------------
+--���ű���������
+insert into Department values('������','��˾�������������IJ���');
+go
+
+--һ���Բ����������
+insert into Department(DepartmentName,DepartmentRemark)
+select '�г���','��ţ�IJ���' union
+select '��Ʒ��','�����ǿյIJ���' union
+select '�ܾ���','�����쵼�IJ���' ;
+go
+
+-------ְ������������
+insert into [Rank](RankName,RankRemark)
+values('����','�����������������')
+insert into [Rank](RankName,RankRemark)
+values('�м�','�߱������������������')
+insert into [Rank](RankName,RankRemark)
+values('�߼�','�߱����Դ���ȫ�����������');
+go
+
+---------��Ա������������
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,3,'����','��','1984-7-9',20000,'13554785452','�ɶ�',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,2,'������','Ů','1987-7-9',15000,'13256854578','����',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,1,'����','��','1988-8-8',12000,'13985745871','����',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,1,'�ŷ�','��','1990-8-8',8000,'13535987412','�˲�',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,3,'����','��','1989-4-8',9000,'13845789568','�˲�',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,3,'����','��','1995-4-8',9500,'13878562568','���',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,2,'�Ƹ�','��','1989-4-20',8500,'13335457412','�人',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,1,'����','Ů','1989-4-20',6500,'13437100050','�人',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,2,'�ܲ�','��','1987-12-20',25000,'13889562354','����',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,3,'����','��','1981-11-11',9000,'13385299632','����',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,1,'��Τ','��','1978-1-13',8000,'13478545263','�Ϻ�',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,1,'����','��','1998-12-12',7500,'13878523695','����',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,3,'���','��','1968-11-22',9000,'13698545841','����',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,3,'���','��','1988-1-22',11000,'13558745874','����',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,2,'��Ȩ','��','1990-2-21',12000,'13698745214','����',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,2,'����','Ů','1995-2-21',13000,'13985478512','�Ϻ�',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,1,'С��','Ů','1996-2-21',13500,'13778787874','����',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,2,'���','��','1992-10-11',8000,'13987455214','�人',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,3,'³��','��','1984-9-10',5500,'13254785965','�ɶ�',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,3,'����','��','1987-5-19',8500,'13352197364','�ɶ�',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,1,'½ѷ','��','1996-5-19',7500,'13025457392','�Ͼ�',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,2,'̫ʷ��','��','1983-6-1',7500,'13077778888','�Ϻ�',getdate())
+
+
+---��ѯ
+select * from Department
+select * from [Rank]
+select * from People 
+
+--1. ����ָ���У��������Ա���н���绰����ѯ�Ա�ΪŮ��Ա����Ϣ,���Զ�����������
+select PeopleName ����,PeopleSex �Ա�,PeopleSalary ��н,PeoplePhone �绰 from People where PeopleSex = 'Ů'
+--2. ��ѯ��н���ڵ���10000 ��Ա����Ϣ( ������ )
+select * from People where PeopleSalary>=10000
+--3. ��ѯ��н���ڵ���10000 ��ŮԱ����Ϣ(������)
+select * from People where PeopleSalary>=10000 and PeopleSex = 'Ů'
+--4. ��ʾ������������1980-1-1֮�󣬶�����н���ڵ���10000��ŮԱ����Ϣ��
+select * from People where PeopleBirth>='1980-1-1' and PeopleSalary>=10000
+--5. ��ʾ����н���ڵ���15000 ��Ա��,������н���ڵ���8000��ŮԱ����Ϣ��
+select * from People where PeopleSalary>=15000 or (PeopleSalary >=8000 and PeopleSex = 'Ů')
+--6. ��ѯ��н��10000-20000 ֮��Ա����Ϣ( ������ )
+select * from People where PeopleSalary between 10000 and 20000
+--7. ��ѯ����ַ�ڱ��������Ϻ���Ա����Ϣ
+select * from People where PeopleAddress ='����' or PeopleAddress ='�Ϻ�'
+--8. ��ѯ����Ա����Ϣ(���ݹ������򣬽�������)
+select * from People order by PeopleSalary desc
+--9. ��ʾ���е�Ա����Ϣ���������ֵij��Ƚ��е�������
+select * from People order by len(PeopleName) desc
+--10. ��ѯ������ߵ�5���˵���Ϣ
+select top 5 * from People order by PeopleSalary desc 
+--11. ��ѯ������ߵ�10%��Ա����Ϣ
+select top 10 percent * from People order by PeopleSalary
+--12. ��ѯ����ַû����д��Ա����Ϣ
+select * from People where PeopleAddress is null
+--13. ��ѯ����ַ�Ѿ���д��Ա����Ϣ
+select * from People where PeopleAddress is not null
+--14. ��ѯ���е�80��Ա����Ϣ
+select * from People where PeopleBirth >='1980-1-1'
+--15. ��ѯ������30-40 ֮�䣬���ҹ�����15000-30000 ֮���Ա����Ϣ
+select * from People where (PeopleSalary between 15000 and 30000) 
+--16. ��ѯ����з 6.22--7.22 ��Ա����Ϣ
+select * from People where (month(PeopleBirth)=6 and day(PeopleBirth)>=22) or (month(PeopleBirth)=7 and day(PeopleBirth)<=22)
+--17. ��ѯ���ʱ����Ƹߵ���
+select PeopleName from People where PeopleSalary >(select PeopleSalary from People where PeopleName = '����')
+--18. ��ѯ����������ͬһ�����е���
+select PeopleName from People where PeopleAddress = (select PeopleAddress from People where PeopleName = '����')
+
+--19. ��ѯ����ФΪ�����Ա��Ϣ
+select  * from People 
+ where year(PeopleBirth)%12=4 
+--20. ��ѯ����Ա����Ϣ������һ����ʾ����(��,ţ,��,��,��,��,��,��,��,��,��,��)
+
+
+--1. ��ѯ������Ա����Ϣ
+select * from People where PeopleName like'��%'
+--2. ��ѯ�����к��� " �� " ��Ա����Ϣ
+select * from People where PeopleName like'%��%'
+--3. ��ʾ�����к��С��С����ߡ�ʷ����Ա����Ϣ
+select * from People where PeopleName like'%��%' or PeopleName like'%ʷ%'
+--4. ��ѯ������Ա����������2����
+select * from People where PeopleName like'��_'
+--5. ��ѯ���������һ�������㣬����һ�������ֵ�Ա����Ϣ
+select * from People where PeopleName like'__��'
+--6. ��ѯ���绰���뿪ͷ138��Ա����Ϣ
+select * from People where PeoplePhone like'138%'
+--7. ��ѯ���绰���뿪ͷ138��Ա����Ϣ,��4λ������7������8 �����һ��������5
+select * from People where PeoplePhone like'138[7,8]%5'
+--8. ��ѯ���绰���뿪ͷ133��Ա����Ϣ,��4λ��2-5֮������� �����һ�����벻��2��3
+select * from People where PeoplePhone like'133[2-5]%[^2-3]'
+
+--1. ��Ա��������
+select count(PeoplePhone)  ������ from People
+--2. �����ֵ������߹���
+select max(PeopleSalary) ��߹���  from People
+--3. ����Сֵ������С����
+select min(PeopleSalary) ������  from People
+--4. ��ͣ�������Ա���Ĺ����ܺ�
+select sum(PeopleSalary) �����ܺ�  from People
+--5. ��ƽ��ֵ��������Ա����ƽ������
+select avg(PeopleSalary) ƽ������  from People
+--6. �����������ֵ����Сֵ���ܺͣ�ƽ��ֵ����һ����ʾ
+select count(PeoplePhone) ������ , max(PeopleSalary) ��߹��� , min(PeopleSalary) ��С���� ,avg(PeopleSalary) ƽ������ from People
+--7. ��ѯ���人������Ա���������ܹ��ʣ���߹��ʣ���͹��ʺ�ƽ������
+select PeopleAddress ����,count(PeoplePhone) ������ , max(PeopleSalary) ��߹��� , min(PeopleSalary) ��С���� ,avg(PeopleSalary) ƽ������ from People
+where  PeopleAddress = '�人'
+group by PeopleAddress
+--8. ������ʱ�ƽ�����ʸߵ���Ա��Ϣ
+select *  from People where PeopleSalary>(select avg(PeopleSalary)  from People)
+--9. ���������������ֵ��������Сֵ�������ܺͣ�����ƽ��ֵ����һ����ʾ
+select count(*) ������ , max (year(getdate())-year(PeopleBirth)) ���, min (year(getdate())-year(PeopleBirth)) ��С ,avg (year(getdate())-year(PeopleBirth)) ƽ�� from People
+--10. �������н��10000 ���ϵ�����Ա����������䣬��С�����ƽ������
+select max(year(getdate())-year(PeopleBirth))��� , min(year(getdate())-year(PeopleBirth)) ��С ,avg(year(getdate())-year(PeopleBirth)) ƽ�� from People
+where PeopleSex ='��' and PeopleSalary>10000
+--11. ͳ�Ƴ����ڵ��ڡ��人���Ϻ���������ŮԱ�������Լ�������䣬��С�����ƽ������
+select max(year(getdate())-year(PeopleBirth)) ��� , min(year(getdate())-year(PeopleBirth)) ��С ,avg(year(getdate())-year(PeopleBirth)) ƽ�� from People
+where PeopleSex ='Ů' and PeopleAddress ='�人' or PeopleAddress ='�Ϻ�'
+--12. ��������ƽ������ߵ���Ա��Ϣ
+select * from People  where year(getdate())-year(PeopleBirth) >(select avg(year(getdate())-year(PeopleBirth)) from People)
+
+select * from Department
+select * from [Rank]
+select * from People 
+
+
+--1. ����Ա�����ڵ�������ͳ��Ա������ ,Ա�������ܺ� ,ƽ�����ʣ���߹��ʺ���͹���
+select PeopleAddress , count(*) ,sum(PeopleSalary) �����ܺ�,avg(PeopleSalary) ƽ������,max(PeopleSalary)��߹���,min(PeopleSalary) ��͹��� from People 
+group by PeopleAddress
+--2. ����Ա�����ڵ�������ͳ��Ա��������Ա�������ܺͣ�ƽ�����ʣ���߹��ʺ���͹��ʣ�1985 �꼰�Ժ������Ա��������ͳ�ơ�
+select PeopleAddress , PeopleBirth,count(*) ,sum(PeopleSalary) �����ܺ�,avg(PeopleSalary) ƽ������,max(PeopleSalary)��߹���,min(PeopleSalary) ��͹��� from People 
+where PeopleBirth <='1985-1-1'
+group by PeopleAddress,PeopleBirth
+--3. ����Ա�����ڵ�������ͳ��Ա��������Ա�������ܺͣ�ƽ�����ʣ���߹��ʺ���͹��ʣ�Ҫ��ɸѡ��Ա������������2�˼����ϵļ�¼������1985�꼰�Ժ������Ա��������ͳ�ơ�
+select PeopleAddress ,count(*) ,sum(PeopleSalary) �����ܺ�,avg(PeopleSalary) ƽ������,max(PeopleSalary)��߹���,min(PeopleSalary) ��͹��� from People 
+where PeopleBirth <='1985-1-1' 
+group by PeopleAddress 
+having count(*)>=2
+
+--1. ��ѯ���人�������е�Ա����Ϣ��Ҫ����ʾ���������Լ�Ա������ϸ����
+select * from  People
+inner join Department on Department.DepartmentId = People.DepartmentId
+where PeopleAddress = '�人'
+--2. ��ѯ���人�������е�Ա����Ϣ��Ҫ����ʾ�������ƣ�ְ�������Լ�Ա������ϸ����
+select * from  People
+inner join Department on Department.DepartmentId = People.DepartmentId
+inner join Rank on Rank.RankId = People.RankId
+where PeopleAddress = '�人'
+--3. ���ݲ��ŷ���ͳ��Ա��������Ա�������ܺͣ�ƽ�����ʣ���߹��ʺ���͹��ʡ�
+select DepartmentId,count(*) ,sum(PeopleSalary) �����ܺ�,avg(PeopleSalary) ƽ������,max(PeopleSalary)��߹���,min(PeopleSalary) ��͹��� from People 
+group by  DepartmentId
+--4. ���ݲ��ŷ���ͳ��Ա��������Ա�������ܺͣ�ƽ�����ʣ���߹��ʺ���͹��ʣ�ƽ��������10000 ���µIJ�����ͳ�ƣ����Ҹ���ƽ�����ʽ������С�
+select DepartmentName,count(*) ,sum(PeopleSalary) �����ܺ�,avg(PeopleSalary) ƽ������,max(PeopleSalary)��߹���,min(PeopleSalary) ��͹��� from People
+left join Department on Department.DepartmentId = People.DepartmentId
+group by  Department.DepartmentId,DepartmentName
+having avg(PeopleSalary) >=10000
+order by avg(PeopleSalary) desc
+--5. ���ݲ������ƣ�Ȼ�����ְλ���ƣ�����ͳ��Ա��������Ա�������ܺͣ�ƽ�����ʣ���߹��ʺ���͹���
+select DepartmentName,RankName,count(*) ,sum(PeopleSalary) �����ܺ�,avg(PeopleSalary) ƽ������,max(PeopleSalary)��߹���,min(PeopleSalary) ��͹��� from People 
+left join Rank on rank.RankId = People.RankId
+left join Department on Department.DepartmentId = People.DepartmentId
+group by  Department.DepartmentId,DepartmentName,Rank.RankId,RankName
+
+select * from Department
+select * from [Rank]
+select * from People 
\ No newline at end of file
diff --git "a/19\351\231\210\345\277\227\346\242\201/SQLQuery2.sql" "b/19\351\231\210\345\277\227\346\242\201/SQLQuery2.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..34e643f143c6b7f82bf4cae74d1f2164e1665ec6
--- /dev/null
+++ "b/19\351\231\210\345\277\227\346\242\201/SQLQuery2.sql"
@@ -0,0 +1,45 @@
+create database Bank
+go
+use Bank
+go
+
+create table CcountInfo(
+	CcId int primary key identity(1,1),
+	CcName nvarchar(50),
+	CcBalance float  not null,
+	CcPassWord int not null
+)
+insert into CcountInfo values('����',263.03,21354)
+create table CcountCard(
+	CardId int primary key identity(1,1),
+	CardNumber int not null,
+	CardDraw float not null,
+	CardBalance float not null,
+	CardPassWord int not null
+)
+insert into CcountCard values(22262,25623.23,568,2156)
+create table CcountTrad(
+	CcountId int primary key identity(1,1),
+	CardNumber int not null,
+	CcountDraw float not null,
+	CcountBalance float not null,
+	CcountPassWord int not null
+)
+insert into CcountTrad values(65451,23.03,956.00,123456)
+create table CcountTrader(
+	CcountId int primary key identity(1,1),
+	CardNumber int not null,
+	CardTrader int not null,
+)
+insert into CcountTrader values(96215,23151)
+create table CcountCheck(
+	CcountId int primary key identity(1,1),
+	CardNumber nvarchar(50) check(CardNumber = '����' or CardNumber = '��ʧ' or CardNumber = '����' or CardNumber = 'ע��')
+	)
+	insert into CcountCheck values('����')
+
+	select * from CcountInfo
+	select * from CcountCard
+	select * from CcountTrad
+	select * from CcountTrader
+	select * from CcountCheck
\ No newline at end of file
diff --git "a/19\351\231\210\345\277\227\346\242\201/\347\254\224\350\256\260.md" "b/19\351\231\210\345\277\227\346\242\201/\347\254\224\350\256\260.md"
new file mode 100644
index 0000000000000000000000000000000000000000..f9d68a6ded9a02f1cb33fe41ad24ac7491b22be0
--- /dev/null
+++ "b/19\351\231\210\345\277\227\346\242\201/\347\254\224\350\256\260.md"
@@ -0,0 +1,139 @@
+1.--default代表字段默认值; check可以规定字段值的约束条件;
+	PeopleSex nvarchar(1) default('男') check(PeopleSex='男' or PeopleSex='女') not null,
+
+2.decimal:
+
+​	PeopleSalary decimal(12,2) check(PeopleSalary>= 1000 and PeopleSalary <= 100000) not null,
+​	
+
+3.--unique代表唯一约束，为数据提供唯一性保证;
+	PeoplePhone nvarchar(20) unique not null,
+
+4.--datetime和smalldatetime都可以表示时间类型，getdate()用于获取系统当前时间
+	PeopleAddTime smalldatetime default(getdate())
+
+5.插入数据
+insert into Department values('行政部','公司主管行政工作的部门');
+
+6.between ...and ...
+
+select * from People where PeopleSalary between 10000 and 20000
+
+7.降序\升序
+
+select * from People order by PeopleSalary desc     \   asc
+
+
+
+8.模糊查询  like    
+
+模糊查询
+%：代表匹配0个字符、1个字符或多个字符。
+_：代表匹配有且只有1个字符。
+[]：代表匹配范围内
+[^]：代表匹配不在范围内
+
+1.)查询姓刘   
+
+select * from People where PeopleName like'刘%'
+
+2.)含有“尚”或者“史”的员工信息
+
+where PeopleName like'%尚%' or PeopleName like'%史%'
+
+3.)名字是2个字
+
+where PeopleName like'刘_'
+
+4.)名字一共三个字的员工信息
+
+where PeopleName like'__香'
+
+5.)开头138的员工信息
+
+where PeoplePhone like'138%'
+
+6.)开头138的员工信息,第4位可能是7，可能8 ，最后一个号码是5
+
+where PeoplePhone like'138[7,8]%5'
+
+7.)开头133的员工信息,第4位是2-5之间的数字 ，最后一个号码不是2和3
+
+where PeoplePhone like'133[2-5]%[^2-3]
+
+
+
+9.限制长度：len
+userName varchar(20) unique not null check(len(userName)>4),
+
+10.round(num,len,[type])
+其中:
+num表示需要处理的数字，len表示需要保留的长度，type处理类型(0是默认值代表四舍五入，非0代表直接截取)
+
+11.year(getdate()) 获取当前时间
+
+12.顺序：
+
+​	select     
+
+​	left jion     
+
+​	group by   
+
+​    having    
+
+​	order by    desc/asc
+
+
+
+13.：范式
+
+**第一范式（1NF）：**
+
+![img](https://img2020.cnblogs.com/blog/944376/202104/944376-20210429144806987-1479266927.png)
+
+
+　　列1唯一确定列2, 列3, 列4, ...，即列2, 列3, 列4, ...不能再分裂出其它列。
+
+　　假设有关系模式列1: 订单名; 列2: 商品。一个订单下可以有多个商品，即列2: 商品可以分裂成商品A, 商品B, 商品C, ...，所以列1: 订单名; 列2: 商品这样的关系模式不符合第一范式。
+
+# 　第二范式（2NF）：
+
+![img](https://img2020.cnblogs.com/blog/944376/202104/944376-20210429145214099-1241070153.png)
+
+ 
+
+ 
+
+ 
+
+ 
+
+
+  满足2NF的前提是必须满足1NF。
+
+　　此外，关系模式需要包含两部分内容。一是必须有一个（及以上）主键；二是没有包含在主键中的列必须全部依赖于全部主键，而不能只依赖于主键的一部分而不依赖全部主键。
+
+  定义听起来有点绕，不慌，直接看图，只有全部的非主键列依赖于全部主键，才满足第二范式。
+
+　　**第三范式（3NF）：**
+
+![img](https://img2020.cnblogs.com/blog/944376/202104/944376-20210429145526908-1013297767.png)
+
+ 
+
+ 
+
+ 
+
+
+　　满足3NF的前提是必须满足2NF。
+
+　　另外关系模式的非主键列必须直接依赖于主键，不能存在传递依赖。即不能存在：非主键列m既依赖于全部主键，又依赖于非主键列n的情况。
+
+　　定义听起来还是有点绕，不慌，直接看图，只要非主键内部存在传递依赖，就不满足第三范式。
+
+　　假设存在关系模式主键1: 课程编号; 列1: 教师名; 列2: 教师家庭地址。显然满足第一范式和第二范式，但是教师家庭地址传递依赖于教师名，所以不满足第三范式。
+
+
+
diff --git "a/33\350\260\267\345\205\206\346\230\216/33\350\260\267\345\205\206\346\230\216.md" "b/33\350\260\267\345\205\206\346\230\216/33\350\260\267\345\205\206\346\230\216.md"
deleted file mode 100644
index 178e9eb4ab84223f22d5026fde9121a62ce10b0f..0000000000000000000000000000000000000000
--- "a/33\350\260\267\345\205\206\346\230\216/33\350\260\267\345\205\206\346\230\216.md"
+++ /dev/null
@@ -1,64 +0,0 @@
-```sql
-create database DBTEST
-go
-
-use DBTEST
-go
-
---*部门信息表*
-create table sectionInfo(
-sectionID  int primary key identity(1,1),--部门编号
-sectionName  varchar(10) not null  --部门名称
-)
-
-insert sectionInfo(sectionName)
-values('技术部'),
-      ('卫生部'),
-	  ('财务部'),
-	  ('人事部'),
-	  ('会计部')
-
-
---*员工信息表*
-create table userInfo(
-userNo int primary key identity(100,1),--员工编号
-userName varchar(10) unique not null check(len(userName)>4),--员工姓名
-userSex  varchar(2) check(userSex='男' or userSex='女') not null,--员工性别
-userAge  int check(userAge between 0 and 100) not null , --员工年龄
-userAddress varchar(50) default('湖北') not null, --员工地址
-userSection int foreign key references sectionInfo(sectionID) --员工部门
-)
-
-insert userInfo(userName,userSex,userAge,userAddress,userSection)
-values('张三das','男',20,'河南省',2),
-      ('李四sda','女',18,'北京',3),
-	  ('王五asd','男',20,'福建省',2),
-	  ('赵六sad','女',30,'河南省',1),
-	  ('田七sad','男',19,'湖南省',2)
-
---*员工考勤表*
-create table workInfo(
-workId int primary key identity(1,1),--考勤编号
-userId int foreign key references userInfo(userNo) not null, --考勤员工
-workTime datetime not null,--考勤时间 
-workDescription  varchar(40) check(workDescription='迟到' or 
-                                   workDescription='早退' or
-                                   workDescription='矿工' or
-                                   workDescription='病假' or 
-                                   workDescription='事假') not null --考勤说明
-                                   )
-
-insert workInfo(userId,workTime,workDescription)
-values (106,'2022-08-17 20:00:00','迟到'),
-       (107,'2022-08-17 20:00:00','迟到'),
-	   (109,'2022-07-17 20:00:00','迟到'),
-	   (108,'2022-04-16 20:00:00','迟到'),
-	   (108,'2022-03-17 20:00:00','迟到')
-
-
-select * from sectionInfo
-select * from userInfo
-select * from workInfo
-
-```
-