diff --git "a/13\345\217\267/.keep" "b/13\345\217\267/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/13\345\217\267/13\345\217\267\351\203\221\346\226\207\346\272\220.sql" "b/13\345\217\267/13\345\217\267\351\203\221\346\226\207\346\272\220.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..0d81c57ac6e251b83c21e4d333f3ad143769880c
--- /dev/null
+++ "b/13\345\217\267/13\345\217\267\351\203\221\346\226\207\346\272\220.sql"
@@ -0,0 +1,53 @@
+CREATE DATABASE DBTEST
+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) NOT NULL UNIQUE,
+	userSex varchar(2) not null default('男') check(userSex='男' or userSex='女'),
+	userAge INT NOT NULL CHECK(userAge>=1 AND userAge<=100),
+	userAddress VARCHAR(50) DEFAULT('湖北') NOT NULL,
+	userSection INT 
+ );
+ Alter table userInfo add constraint FK_StuInfo_ClassId foreign key(userSection) references sectionInfo(sectionID)
+ CREATE TABLE workInfo(
+	workId INT primary key identity(1,1),
+	userId  INT,
+	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')
+ );
+ Alter table workInfo add constraint FK_workInfo_ClassId foreign key(userId) references userInfo(userNo);
+ insert into sectionInfo VALUES('运行部');
+ INSERT INTO userInfo
+ (
+     userName,
+     userSex,
+     userAge,
+     userAddress,
+     userSection
+ )
+ VALUES
+ (   '老婆', -- userName - varchar(10)
+     '女', -- userSex - varchar(2)
+     20,  -- userAge - int
+     '零零', -- userAddress - varchar(50)
+     2   -- userSection - int
+     );
+ INSERT INTO workInfo
+ (
+     userId,
+     workTime,
+     workDescription
+ )
+ VALUES
+ (   1,         -- userId - int
+     GETDATE(), -- workTime - datetime
+     '迟到'         -- workDescription - varchar(40)
+     )
+
+  SELECT * FROM sectionInfo;
+  SELECT * FROM userInfo;
+  SELECT * FROM workInfo;
\ No newline at end of file
diff --git "a/13\345\217\267/\347\254\224\350\256\260.txt" "b/13\345\217\267/\347\254\224\350\256\260.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..36316652f69789067b898d8bac1144044e7bed69
--- /dev/null
+++ "b/13\345\217\267/\347\254\224\350\256\260.txt"
@@ -0,0 +1,58 @@
+--鍏崇郴鍨嬫暟鎹簱:SQL server, Mysql, Oracle 
+--鍒涘缓鏁版嵁搴擄細create database 鏁版嵁搴撳悕
+--database:鏁版嵁搴�
+
+if exists (select * from sys.databases where name='DBTEST')
+ drop database DBTEST
+
+ create database DBTEST
+
+ --浣跨敤鏁版嵁搴�
+ use dbtest
+
+ --鍒涘缓鐝骇琛�
+ create table ClassInfo(
+	ClassId int primary key identity(1,1),
+	ClassName varchar(20)
+ );
+
+ --鎻掑叆鏁版嵁锛� insert [into] 琛ㄥ悕(瀛楁鍚�) values(鍊�)
+ insert into ClassInfo( ClassName) values('杞欢1鐝�');
+ 
+ insert ClassInfo values('杞欢2鐝�')
+
+ select * from ClassInfo
+
+ --鍒涘缓鏁版嵁琛�
+ create table StuInfo(
+	stuId int primary key identity(1001,1),  --瀛︾敓ID
+	--娣诲姞涓�涓鏌ョ害鏉燂紝鍒ゆ柇鐢ㄦ埛鎻掑叆/鏂板鐨勬暟鎹紝鎬у埆瀛楁鏄笉鏄敺鎴栬�呭コ
+	--default:榛樿绾︽潫
+	--check
+	stugender varchar(2) not null default('鐢�') check(stugender='鐢�' or stugender='濂�'),   --瀛︾敓鎬у埆
+	stuphone char(11) check(len(stuphone)=11) unique,
+	--鍒涘缓鐝骇澶栭敭
+	--ClassID int references ClassInfo(ClassID)
+	ClassID int
+	
+ );
+
+
+ --澧炲姞澶栭敭
+ --淇敼琛ㄧ粨鏋� 琛ㄥ悕 add constraint 绾︽潫鍚� foreign key(瑕佸紩鐢ㄧ殑瀛楁) references 涓婚敭琛�(瀛楁)
+ Alter table StuInfo add constraint FK_StuInfo_ClassId foreign key(ClassID) references ClassInfo(ClassID)
+
+
+ --鏂板濮撳悕鍒�
+ alter table StuInfo add stuName varchar(20)
+
+
+
+ --濡傛灉娌＄粰鍑哄垪鍚嶏紝榛樿鏄寜鐓ч『搴忎竴涓釜娣诲姞
+ --insert StuInfo values('濂�',13888888888)
+
+ --insert StuInfo(stuphone) values(15888888888)
+
+
+
+ select * from StuInfo;
\ No newline at end of file
diff --git "a/13\345\217\267\351\203\221\346\226\207\346\272\220/.keep" "b/13\345\217\267\351\203\221\346\226\207\346\272\220/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/13\345\217\267\351\203\221\346\226\207\346\272\220/\344\275\234\344\270\232/.keep" "b/13\345\217\267\351\203\221\346\226\207\346\272\220/\344\275\234\344\270\232/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/13\345\217\267\351\203\221\346\226\207\346\272\220/\344\275\234\344\270\232/2022.9.16\344\275\234\344\270\232.sql" "b/13\345\217\267\351\203\221\346\226\207\346\272\220/\344\275\234\344\270\232/2022.9.16\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..ebf1aee7770fc08980360baa000a4dc69ad64bbc
--- /dev/null
+++ "b/13\345\217\267\351\203\221\346\226\207\346\272\220/\344\275\234\344\270\232/2022.9.16\344\275\234\344\270\232.sql"
@@ -0,0 +1,81 @@
+--查询出巨蟹 6.22--7.22 的员工信息
+select * from People
+where datename(month,PeopleBirth) = 6 and day(PeopleBirth) between 22 and 30
+or datename(month,PeopleBirth) = 7 and day(PeopleBirth) between 1 and 22;
+
+
+--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 
+
+
+--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 p.*,d.DepartmentName from People p
+inner join Department d 
+on p.DepartmentId = d.DepartmentId
+where p.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 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 p.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(D.DepartmentName)部门员工人数,sum(p.PeopleSalary)员工工资总和,convert(decimal(10,2),
+avg(p.PeopleSalary))平均工资,max(p.PeopleSalary)最高工资,min(p.PeopleSalary)最低工资
+from People p
+inner join Department d
+on p.DepartmentId = d.DepartmentId
+group by d.DepartmentName
+
+
+--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(D.DepartmentName)部门员工人数,sum(p.PeopleSalary)员工工资总和,convert(decimal(10,2),
+avg(p.PeopleSalary))平均工资,max(p.PeopleSalary)最高工资,min(p.PeopleSalary)最低工资
+from People p
+inner join Department d
+on p.DepartmentId = d.DepartmentId
+group by d.DepartmentName
+having avg(p.PeopleSalary) > 10000
+order by 平均工资 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 d.DepartmentName,r.RankName,count(*)员工人数,
+sum(p.PeopleSalary)员工工资总和,convert(decimal(10,2),
+avg(p.PeopleSalary))平均工资,max(p.PeopleSalary)最高工资,min(p.PeopleSalary)最低工资
+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
\ No newline at end of file
diff --git "a/13\345\217\267\351\203\221\346\226\207\346\272\220/\347\254\224\350\256\260/.keep" "b/13\345\217\267\351\203\221\346\226\207\346\272\220/\347\254\224\350\256\260/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/13\345\217\267\351\203\221\346\226\207\346\272\220/\347\254\224\350\256\260/2022.9.16\347\254\224\350\256\260.md" "b/13\345\217\267\351\203\221\346\226\207\346\272\220/\347\254\224\350\256\260/2022.9.16\347\254\224\350\256\260.md"
new file mode 100644
index 0000000000000000000000000000000000000000..1e7e72891899843b8ed78de6eb7eb342d5f947a7
--- /dev/null
+++ "b/13\345\217\267\351\203\221\346\226\207\346\272\220/\347\254\224\350\256\260/2022.9.16\347\254\224\350\256\260.md"
@@ -0,0 +1,45 @@
+# 1.妯＄硦鏌ヨ
+
+```sql
+[]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
+```
+
+```sql
+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.CONVERT()涓嶤AST()鍑芥暟:
+
+```sql
+
+convert(decimal(13,2),12.45454)
+cast(12.45454 as decimal(13,2))
+```
+
+# 3.鏃堕棿鍑芥暟
+
+```sql
+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