diff --git "a/50\350\234\227\347\211\233/\347\254\224\350\256\260/2022-09-15-\347\240\201\344\272\221\346\217\220\344\272\244\347\254\224\350\256\260.md" "b/50\350\234\227\347\211\233/\347\254\224\350\256\260/2022-09-15-\347\240\201\344\272\221\346\217\220\344\272\244\347\254\224\350\256\260.md"
deleted file mode 100644
index 35bdd145c85027a308e726da741a87dc05795a97..0000000000000000000000000000000000000000
--- "a/50\350\234\227\347\211\233/\347\254\224\350\256\260/2022-09-15-\347\240\201\344\272\221\346\217\220\344\272\244\347\254\224\350\256\260.md"
+++ /dev/null
@@ -1,29 +0,0 @@
-1.SQLServer 2014下载:
-
-https://blog.csdn.net/lililove2000/article/details/115673285
-
-2.创建数据库
-
-```sql
-create database 数据库名
-```
-
-3.创建数据表
-
-```sql
-create table 表名(
-)
-```
-
-
-
-4.数据约束
-
-5.插入数据
-
-6.修改数据
-
-7.删除数据
-
-8.查询数据
-
diff --git "a/\345\273\226\346\262\273\345\205\210/.keep" "b/\345\273\226\346\262\273\345\205\210/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\345\273\226\346\262\273\345\205\210/\344\275\234\344\270\232/2022-9-15\344\275\234\344\270\232.sql" "b/\345\273\226\346\262\273\345\205\210/\344\275\234\344\270\232/2022-9-15\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..519481aca46afb8dc591986b6f8697ea6ae089ca
--- /dev/null
+++ "b/\345\273\226\346\262\273\345\205\210/\344\275\234\344\270\232/2022-9-15\344\275\234\344\270\232.sql"
@@ -0,0 +1,43 @@
+CREATE DATABASE DBTEST;
+USE dbtest
+if exists (select * from sys.databases  where name='sectionInfo')
+drop table sectionInfo
+
+create table sectionInfo(
+	sectionID int primary key identity(1,1),
+	sectionName varchar(10) not null
+);
+
+create table userInfo(
+	userNo  int primary key identity(1,1) not null,
+	userName  varchar(10) unique not null check(len(userName)>=4),
+	userSex   varchar(2) not null check(userSex ='��' or userSex ='Ů'),
+	userAge   int not null check(0<userAge and userAge<100),
+	userAddress  varchar(50) default('����'),
+	userSection  int references sectionInfo(sectionID)
+);
+
+create table workInfo(
+	workId int primary key identity(1,1) not null,
+	 userId  int references userInfo(userNo) not null,
+	 workTime datetime  not null,
+	 workDescription  varchar(40) not null check(workDescription='�ٵ�' OR workDescription='����' OR workDescription='����'OR workDescription='����'OR workDescription='�¼�')
+);
+
+insert into sectionInfo values('������');
+insert into sectionInfo values('����');
+insert into sectionInfo values('����������');
+insert into sectionInfo values('Ӫ����');
+insert into sectionInfo values('������');
+
+insert into userInfo values('����','��','30','����','1');
+insert into userInfo values('����','��','30','����','2');
+insert into userInfo values('����','��','30','����','3');
+insert into userInfo values('����','��','30','�㶫','4');
+insert into userInfo values('����','��','30','����','5');
+
+insert into workInfo values(1,GETDATE(),'�ٵ�');
+insert into workInfo values(2,GETDATE(),'����');
+insert into workInfo values(3,GETDATE(),'����');
+insert into workInfo values(4,GETDATE(),'����');
+insert into workInfo values(5,GETDATE(),'�¼�');
\ No newline at end of file
diff --git "a/\345\273\226\346\262\273\345\205\210/\344\275\234\344\270\232/2022-9-16\344\275\234\344\270\232.sql" "b/\345\273\226\346\262\273\345\205\210/\344\275\234\344\270\232/2022-9-16\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..d4e7f0bbe2de2535c2488ae5dc195afd903fa6cd
--- /dev/null
+++ "b/\345\273\226\346\262\273\345\205\210/\344\275\234\344\270\232/2022-9-16\344\275\234\344\270\232.sql"
@@ -0,0 +1,52 @@
+--1. ��ѯ���人�������е�Ա����Ϣ��Ҫ����ʾ���������Լ�Ա������ϸ����
+	select p.*,d.DepartmentName from people p
+	inner join Department d on p.departmentid=d.departmentid
+	where PeopleAddress='�人'
+	;
+--2. ��ѯ���人�������е�Ա����Ϣ��Ҫ����ʾ�������ƣ�ְ�������Լ�Ա������ϸ����
+	select p.*,d.DepartmentName,r.RankName from people p
+	inner join Department d on p.departmentid=d.departmentid
+	inner join rank r on r.RankId=p.RankId
+	where PeopleAddress='�人'
+	;
+--3. ���ݲ��ŷ���ͳ��Ա��������Ա�������ܺͣ�ƽ�����ʣ���߹��ʺ���͹��ʡ�
+	select sum(PeopleSalary)�����ܺ�,avg(PeopleSalary)ƽ������,MAX(PeopleSalary)��߹���,min(PeopleSalary)��͹��� from people p
+	inner join Department d on p.departmentid=d.departmentid
+	group by d.DepartmentName
+--4. ���ݲ��ŷ���ͳ��Ա��������Ա�������ܺͣ�ƽ�����ʣ���߹��ʺ���͹��ʣ�ƽ��������10000 ���µIJ�����ͳ�ƣ����Ҹ���ƽ�����ʽ������С�
+	select sum(PeopleSalary)�����ܺ�,avg(PeopleSalary)ƽ������,MAX(PeopleSalary)��߹���,min(PeopleSalary)��͹��� from people p
+	inner join Department d on p.departmentid=d.departmentid
+	group by d.DepartmentName
+	having avg(PeopleSalary)>10000
+	;
+
+--5. ���ݲ������ƣ�Ȼ�����ְλ���ƣ�����ͳ��Ա��������Ա�������ܺͣ�ƽ�����ʣ���߹��ʺ���͹���
+	select count(*) Ա������,sum(PeopleSalary)�����ܺ�,avg(PeopleSalary)ƽ������,MAX(PeopleSalary)��߹���,min(PeopleSalary)��͹��� from People p
+	inner join Department d on p.departmentid=d.departmentid
+	inner join rank r on r.RankId=p.RankId
+	group by d.DepartmentName,r.RankName
+	;
+--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)
+	;
+--20. ��ѯ����Ա����Ϣ������һ����ʾ����(��,ţ,��,��,��,��,��,��,��,��,��,��)
+	select *,
+		case year(peoplebirth)%12
+		when 4 then '��'
+		when 5 then 'ţ'
+		when 6 then '��'
+		when 7 then '��'
+		when 8 then '��'
+		when 9 then '��'
+		when 10 then '��'
+		when 11 then '��'
+		when 0 then '��'
+		when 1 then '��'
+		when 2 then '��'
+		when 3 then '��'
+		end
+	��Ф
+	from People 
+	;
\ No newline at end of file
diff --git "a/\345\273\226\346\262\273\345\205\210/\347\254\224\350\256\260/2022-9-15\347\254\224\350\256\260.md" "b/\345\273\226\346\262\273\345\205\210/\347\254\224\350\256\260/2022-9-15\347\254\224\350\256\260.md"
new file mode 100644
index 0000000000000000000000000000000000000000..29bc7f7f79c54e2221962d5e74e1f8168a23abb0
--- /dev/null
+++ "b/\345\273\226\346\262\273\345\205\210/\347\254\224\350\256\260/2022-9-15\347\254\224\350\256\260.md"
@@ -0,0 +1,25 @@
+创建数据库：
+create database 数据库名
+database（代表数据库）
+
+if exists (select * from sys.databases where name='数据库名')
+drop（删除） database 数据库名
+
+
+使用数据库
+ use dbtest
+
+创建表
+create table 表名
+
+1.主键：primary key
+2.自增：identity(开始值,自增的值)
+3.默认:default()
+4.唯一：unique
+5.外键:references 主表名(列名)
+          foreign key(要引用的字段)
+6.新增列：alter table 表名 add 新增列名 类型(int...)
+7.非空:not null 
+8.检查(限制条件):check (列名 <,=,> '条件')
+
+删除表:drop table 表名
\ No newline at end of file
diff --git "a/\345\273\226\346\262\273\345\205\210/\347\254\224\350\256\260/2022-9-16\347\254\224\350\256\260.md" "b/\345\273\226\346\262\273\345\205\210/\347\254\224\350\256\260/2022-9-16\347\254\224\350\256\260.md"
new file mode 100644
index 0000000000000000000000000000000000000000..dcd271e0cd726963f21adbd81f0a3de6571aa91f
--- /dev/null
+++ "b/\345\273\226\346\262\273\345\205\210/\347\254\224\350\256\260/2022-9-16\347\254\224\350\256\260.md"
@@ -0,0 +1,32 @@
+查询排重：distinct
+
+排序: order by asc(升序) desc(降序)
+
+分组查询：group by
+
+时间:
+年：year(列名)
+月：month(列名)
+日：day(列名)
+
+模糊查询：like
+%：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
+
+聚合函数：
+count:求数量
+max:求最大值
+min:求最小值
+sum:求和
+avg:求平均值
+
+保留小数类型:
+round(要修改的数,保留位数)
+
+强制转换类型:
+conver(要改变的类型(int,decimal(),....),要修改的数)  
+cast（要修改的数 as 要改变的类型(int,decimal(),....)）
+
+