diff --git "a/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-27/.keep" "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-27/.keep"
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diff --git "a/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-27/2022-09-27\344\275\234\344\270\232.md" "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-27/2022-09-27\344\275\234\344\270\232.md"
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+```SQL
+create database bumen
+go
+use bumen
+go
+--部门
+create table Department
+(
+	DepartmentId varchar(10) primary key , --主键，自动增长
+	DepartmentName nvarchar(50), --部门名称
+)
+--人员信息
+create table People
+(
+	PeopleId int primary key identity(1,1), --主键,自动增长
+	DepartmentId varchar(10), --部门编号,外键,与部门表关联
+	PeopleName nvarchar(20), --人员姓名
+	PeopleSex nvarchar(2), --人员性别
+	PeopleSalary money, --薪水
+)
+insert into Department(DepartmentId,DepartmentName)
+values('001','总经办')
+insert into Department(DepartmentId,DepartmentName)
+values('002','市场部')
+insert into Department(DepartmentId,DepartmentName)
+values('003','人事部')
+insert into Department(DepartmentId,DepartmentName)
+values('004','财务部')
+
+insert into People(DepartmentId,PeopleName,PeopleSex,PeopleSalary)
+values('001','刘备','男',8000)
+insert into People(DepartmentId,PeopleName,PeopleSex,PeopleSalary)
+values('001','关羽','男',5000)
+insert into People(DepartmentId,PeopleName,PeopleSex,PeopleSalary)
+values('002','张飞','男',3000)
+
+select * from Department
+select *from People
+
+
+--（1）假设有部门表和员工表，在添加员工的时候，该员工的部门编号如果在部门表中找不到，则自动添加部门信息，部门名称为"新部门"。
+go
+create trigger tr_tianjia
+on People after insert
+as
+begin
+   declare @e varchar(20)=(select DepartmentId from inserted)
+   if @e not in (select DepartmentId from Department)
+   begin 
+     insert into Department values(@e,'新部门')
+   end
+end
+go
+insert into People values('005','猴子','男',2000)
+drop trigger tr_tianjia
+--（2）触发器实现，删除一个部门的时候将部门下所有员工全部删除。
+go
+create trigger tr_sc
+on Department after delete
+as
+begin
+    declare @e varchar(20)=(select DepartmentId from deleted)
+	delete People where DepartmentId=@e
+end
+go
+drop trigger tr_sc
+ delete Department where DepartmentId='005'
+--（3）创建一个触发器，删除一个部门的时候判断该部门下是否有员工，有则不删除，没有则删除。
+go
+create trigger t3
+on Department instead of delete
+as
+begin
+if (select count(*) from People where DepartmentId = (select DepartmentId from deleted)) = 0
+begin
+	delete Department where DepartmentId =(select DepartmentId from deleted)
+end
+end
+go
+delete Department where DepartmentId ='006'
+insert into Department values('006','新新部门')
+--（4）修改一个部门编号之后，将该部门下所有员工的部门编号同步进行修改
+go
+create trigger t4
+on Department instead of update
+as
+begin
+
+update People set DepartmentId = (select DepartmentId from inserted) 
+where DepartmentId = (select DepartmentId from Department where DepartmentName = '新部门')
+
+update Department set DepartmentId =(select DepartmentId from inserted) 
+where DepartmentName = '新部门'
+
+end
+go
+update Department set DepartmentId ='007' where DepartmentName = '新部门'
+```
+
diff --git "a/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-27\350\247\246\345\217\221\345\231\250/.keep" "b/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-27\350\247\246\345\217\221\345\231\250/.keep"
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index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-27\350\247\246\345\217\221\345\231\250/2022-9-27\347\254\224\350\256\260.md" "b/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-27\350\247\246\345\217\221\345\231\250/2022-9-27\347\254\224\350\256\260.md"
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index 0000000000000000000000000000000000000000..57c22f8810c96c0985c27f418f3c9982cffe61ee
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+++ "b/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-27\350\247\246\345\217\221\345\231\250/2022-9-27\347\254\224\350\256\260.md"
@@ -0,0 +1,54 @@
+## 触发器（trigger）
+
+#### 什么是触发器
+
+ **触发器**（ trigger ）是作为**对数据库修改的连带效果**而**由系统自动执行**的一条语句。它是一种特殊的**存储过程**。也是一个**事务**（可以回滚）。为了定义一个[触发器](https://so.csdn.net/so/search?q=触发器&spm=1001.2101.3001.7020)，我们必须：
+
+- 指明**什么时候执行触发器**。这被拆分为**引起触发器被检测的一个\*事件\***和**触发器继续执行所必须满足的一个条件**。
+- 指明**当触发器执行时所采取的动作**。
+
+#### 触发器分类
+
+分为 DML触发器和DDL触发器 
+
+#### DML触发器  ： 增删改
+
+##### after触发器：  
+
+after触发器主要用于：insert，update，delete
+
+##### instead of 触发器     
+
+#### 创建触发器的语句
+
+```sql
+CREATE TRIGGER <触发器名称>
+ 
+ON table_name
+ 
+[WITH ENCRYPTION]
+ 
+FOR [DELETE, INSERT, UPDATE]
+ 
+AS
+ 
+  T-SQL语句
+ 
+GO
+--WITH ENCRYPTION表示加密触发器定义的SQL文本
+
+--DELETE, INSERT, UPDATE指定触发器的类型
+```
+
+## 总结
+
+ 1.插入操作（Insert） 
+***\*inserted 表\****有数据，***\*deleted 表\****无数据 
+
+2.删除操作（Delete） 
+***\*inserted 表\****无数据，***\*deleted 表\****有数据 
+
+3.更新操作（Update） 
+***\*inserted 表\****有数据（新数据），***\*deleted 表\****有数据（旧数据） 
+
+