diff --git "a/17\345\220\264\346\226\207\351\276\231/\344\275\234\344\270\232/2022-9-18\346\237\245\350\257\242.sql" "b/17\345\220\264\346\226\207\351\276\231/\344\275\234\344\270\232/2022-9-18\346\237\245\350\257\242.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..69acb209afc2a7c42370df865ed779bab457ea8b
--- /dev/null
+++ "b/17\345\220\264\346\226\207\351\276\231/\344\275\234\344\270\232/2022-9-18\346\237\245\350\257\242.sql"
@@ -0,0 +1,218 @@
+if exists(select * from sys.databases where name='DBTEST')
+drop database DBTEST1;
+go
+
+create database DBTEST1;
+go
+
+use DBTEST1;
+go
+
+--创建部门表
+create table Department 
+(
+	--创建部门编号;int代表整数类型;primary key代表主键;identity(1,1)代表从1开始步长为1自增长;
+	DepartmentId int primary key identity(1,1),
+	--创建部门名称;nvarchar(50)代表长度50的字符串;not null代表不能为空;
+	DepartmentName nvarchar(50) not null,
+	--创建部门描述；text代表长文本;
+	DepartmentRemark text
+);
+go
+
+--创建职级表，rank为系统关键字，此处使用[]代表自定义名字，而非系统关键字
+create table [Rank]
+(
+	RankId int primary key identity(1,1),
+	RankName nvarchar(50) not null,
+	RankRemark text
+);
+go
+
+--创建员工信息表
+create table People
+(
+	PeopleId int primary key identity(1,1),
+	--references代表外键引用,此字段必须符合与其它表的外键约束
+	DepartmentId int references Department(DepartmentId)  not null,
+	RankId int references [Rank](RankId) not null,
+	PeopleName nvarchar(50) not null,
+	--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,
+	PeopleBirth datetime not null,
+	PeopleSalary decimal(12,2) check(PeopleSalary>= 1000 and PeopleSalary <= 100000) not null,
+	--unique代表唯一约束，为数据提供唯一性保证;
+	PeoplePhone nvarchar(20) unique not null,
+	PeopleAddress nvarchar(100),
+	--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())
+);
+go
+
+
+
+------------------------------插入数据部分------------------------------
+--部门表插入数据
+insert into Department values('行政部','公司主管行政工作的部门');
+go
+
+--一次性插入多条数据
+insert into Department(DepartmentName,DepartmentRemark)
+select '市场部','吹牛的部门' union
+select '产品部','天马星空的部门' union
+select '总经办','都是领导的部门' ;
+go
+
+-------职级表插入数据
+insert into [Rank](RankName,RankRemark)
+values('初级','辅助其他人完成任务')
+insert into [Rank](RankName,RankRemark)
+values('中级','具备独立处理事务的能力')
+insert into [Rank](RankName,RankRemark)
+values('高级','具备可以带动全场节奏的能力');
+go
+
+---------向员工表插入数据
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,3,'刘备','男','1984-7-9',20000,'13554785452','成都',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,2,'孙尚香','女','1987-7-9',15000,'13256854578','荆州',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,1,'关羽','男','1988-8-8',12000,'13985745871','荆州',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,1,'张飞','男','1990-8-8',8000,'13535987412','宜昌',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,3,'赵云','男','1989-4-8',9000,'13845789568','宜昌',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,3,'马超','男','1995-4-8',9500,'13878562568','香港',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,2,'黄盖','男','1989-4-20',8500,'13335457412','武汉',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,1,'貂蝉','女','1989-4-20',6500,'13437100050','武汉',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,2,'曹操','男','1987-12-20',25000,'13889562354','北京',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,3,'许褚','男','1981-11-11',9000,'13385299632','北京',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,1,'典韦','男','1978-1-13',8000,'13478545263','上海',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,1,'曹仁','男','1998-12-12',7500,'13878523695','深圳',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,3,'孙坚','男','1968-11-22',9000,'13698545841','广州',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,3,'孙策','男','1988-1-22',11000,'13558745874','深圳',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,2,'孙权','男','1990-2-21',12000,'13698745214','深圳',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,2,'大乔','女','1995-2-21',13000,'13985478512','上海',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,1,'小乔','女','1996-2-21',13500,'13778787874','北京',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,2,'周瑜','男','1992-10-11',8000,'13987455214','武汉',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(2,3,'鲁肃','男','1984-9-10',5500,'13254785965','成都',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(3,3,'吕蒙','男','1987-5-19',8500,'13352197364','成都',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,1,'陆逊','男','1996-5-19',7500,'13025457392','南京',getdate())
+
+insert into People(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,
+PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime)
+values(1,2,'太史慈','男','1983-6-1',7500,'13077778888','上海',getdate())
+
+
+--1. 查询出武汉地区所有的员工信息，要求显示部门名称以及员工的详细资料
+SELECT*FROM People p
+join Department d on d. DepartmentId = p.DepartmentId
+where PeopleAddress='武汉'
+;
+--2. 查询出武汉地区所有的员工信息，要求显示部门名称，职级名称以及员工的详细资料
+SELECT*FROM People p
+join Department d on d. DepartmentId = p.DepartmentId
+join Rank r on r.RankId=p.RankId
+where PeopleAddress='武汉';
+
+--3. 根据部门分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资。
+select count(p.DepartmentId) 员工人数,SUM(PeopleSalary)员工工资总和,avg(PeopleSalary)平均工资,MAX(PeopleSalary)最高工资,MIN(PeopleSalary)最低工资 from  People p
+join Department d on d. DepartmentId = p.DepartmentId
+group by p.DepartmentId
+--4. 根据部门分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资，平均工资在10000 以下的不参与统计，并且根据平均工资降序排列。
+select count(p.DepartmentId) 员工人数,SUM(PeopleSalary)员工工资总和,avg(PeopleSalary)平均工资,MAX(PeopleSalary)最高工资,MIN(PeopleSalary)最低工资  from  People p
+join Department d on d. DepartmentId = p.DepartmentId
+group by p.DepartmentId 
+having  avg(PeopleSalary)>10000
+order by avg(PeopleSalary) desc;
+--5. 根据部门名称，然后根据职位名称，分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资
+select  DepartmentName,RankId,COUNT(People.DepartmentId)人数,SUM(PeopleSalary)工资总和,AVG(PeopleSalary)平均工资,MAX(PeopleSalary)最高工资,MIN(PeopleSalary)最低工资 from People 
+inner join Department on People.DepartmentId=Department.DepartmentId
+group by RankId,DepartmentName
+--6.查询出巨蟹 6.22--7.22 的员工信息
+select * from People where MONTH(PeopleBirth)+CONVERT(float,DAY(PeopleBirth))/100 between 6.22 and 7.22
+--7.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 =0 
+	then '猴'
+	when YEAR(PeopleBirth)%12=1
+	then '鸡'
+	when YEAR(PeopleBirth)%12=2
+	then '狗'
+	when YEAR(PeopleBirth)%12=3
+	then '猪'
+	when YEAR(PeopleBirth)%12=4
+	then '鼠'
+	when YEAR(PeopleBirth)%12=5
+	then '牛'
+	when YEAR(PeopleBirth)%12=6
+	then '虎'
+	when YEAR(PeopleBirth)%12=7
+	then '兔'
+	when YEAR(PeopleBirth)%12=8
+	then '龙'
+	when YEAR(PeopleBirth)%12=9
+	then '蛇'
+	when YEAR(PeopleBirth)%12=10
+	then '马'
+	when YEAR(PeopleBirth)%12=11
+	then '羊'
+	end 生肖  from People	
\ No newline at end of file
diff --git "a/17\345\220\264\346\226\207\351\276\231/\347\254\224\350\256\260/2022-9-18\347\254\254\344\272\214\346\254\241\347\254\224\350\256\260.md" "b/17\345\220\264\346\226\207\351\276\231/\347\254\224\350\256\260/2022-9-18\347\254\254\344\272\214\346\254\241\347\254\224\350\256\260.md"
new file mode 100644
index 0000000000000000000000000000000000000000..039f865a7d1664101efae2893bf099f3f800905d
--- /dev/null
+++ "b/17\345\220\264\346\226\207\351\276\231/\347\254\224\350\256\260/2022-9-18\347\254\254\344\272\214\346\254\241\347\254\224\350\256\260.md"
@@ -0,0 +1,86 @@
+#  1.妯＄硦鏌ヨ
+
+```
+[]锛氫唬琛ㄥ尮閰嶈寖鍥村唴
+[^]锛氫唬琛ㄥ尮閰嶄笉鍦ㄨ寖鍥村唴
+select * from Department where DepartmentId like   '[1-3]'
+
+// [1-3] == 1,2,3
+
+select * from Department where DepartmentId like   '[^1-3]'
+
+//[^1-3] == 4
+```
+
+# 2.ROUND鍑芥暟鐢ㄦ硶锛�
+
+```sql
+round(num,len,[type])
+鍏朵腑:
+num琛ㄧず闇�瑕佸鐞嗙殑鏁板瓧锛宭en琛ㄧず闇�瑕佷繚鐣欑殑闀垮害锛宼ype澶勭悊绫诲瀷(0鏄粯璁ゅ�间唬琛ㄥ洓鑸嶄簲鍏ワ紝闈�0浠ｈ〃鐩存帴鎴彇)
+select ROUND(123.45454,3)  --123.45500
+select ROUND(123.45454,3,1) --123.45400
+```
+
+# 3.CONVERT()涓嶤AST()鍑芥暟:
+
+```sql
+--1.淇濈暀灏忔暟
+convert(decimal(13,2),12.45454)
+cast(12.45454 as decimal(13,2))
+--2.寮哄埗杞崲绫诲瀷
+```
+
+
+
+# 4.鑱氬悎鍑芥暟
+
+SQL SERVER涓仛鍚堝嚱鏁颁富瑕佹湁锛�
+
+```sql
+count:姹傛暟閲�
+max:姹傛渶澶у��
+min:姹傛渶灏忓��
+sum:姹傚拰
+avg:姹傚钩鍧囧��
+```
+
+# 5.鏉′欢鏌ヨ
+
+**SQL涓父鐢ㄨ繍绠楃**
+
+```sql
+=锛氱瓑浜庯紝姣旇緝鏄惁鐩哥瓑鍙婅祴鍊�
+!=锛氭瘮杈冧笉绛変簬
+>锛氭瘮杈冨ぇ浜�
+<锛氭瘮杈冨皬浜�
+>=锛氭瘮杈冨ぇ浜庣瓑浜�
+<=锛氭瘮杈冨皬浜庣瓑浜�
+IS NULL锛氭瘮杈冧负绌�
+IS NOT NULL锛氭瘮杈冧笉涓虹┖
+in锛氭瘮杈冩槸鍚﹀湪鍏朵腑
+like锛氭ā绯婃煡璇�
+BETWEEN...AND...锛氭瘮杈冩槸鍚﹀湪涓よ�呬箣闂� 50-100   BETWEEN 50 AND 100
+and锛氶�昏緫涓庯紙涓や釜鏉′欢鍚屾椂鎴愮珛琛ㄨ揪寮忔垚绔嬶級
+or锛氶�昏緫鎴栵紙涓や釜鏉′欢鏈変竴涓垚绔嬭〃杈惧紡鎴愮珛锛� 
+not锛氶�昏緫闈烇紙鏉′欢鎴愮珛锛岃〃杈惧紡鍒欎笉鎴愮珛锛涙潯浠朵笉鎴愮珛锛岃〃杈惧紡鍒欐垚绔嬶級
+```
+
+# 6.鏃堕棿鍑芥暟
+
+```
+select DATEDIFF(day, '2019-08-20', getDate());    --鑾峰彇鎸囧畾鏃堕棿鍗曚綅鐨勫樊鍊�
+SELECT DATEADD(MINUTE,-5,GETDATE())               --鍔犲噺鏃堕棿,姝ゅ涓鸿幏鍙栦簲鍒嗛挓鍓嶇殑鏃堕棿,MINUTE 琛ㄧず鍒嗛挓锛屽彲涓� YEAR,MONTH,DAY,HOUR
+select DATENAME(month, getDate());                --褰撳墠鏈堜唤
+select DATENAME(WEEKDAY, getDate());              --褰撳墠鏄熸湡鍑�
+select DATEPART(month, getDate());                --褰撳墠鏈堜唤
+select DAY(getDate());                            --杩斿洖褰撳墠鏃ユ湡澶╂暟
+select MONTH(getDate());                          --杩斿洖褰撳墠鏃ユ湡鏈堟暟
+select YEAR(getDate());                           --杩斿洖褰撳墠鏃ユ湡骞存暟
+
+SELECT CONVERT(VARCHAR(22),GETDATE(),20)          --2020-01-09 14:46:46
+SELECT CONVERT(VARCHAR(24),GETDATE(),21)          --2020-01-09 14:46:55.91
+SELECT CONVERT(VARCHAR(22),GETDATE(),23)		  --2020-01-09
+SELECT CONVERT(VARCHAR(22),GETDATE(),24)          --15:04:07
+Select CONVERT(varchar(20),GETDATE(),14)          --15:05:49:330
+```
\ No newline at end of file