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+--（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"。
+
+```sql
+go
+create trigger tri_insertssss
+on people after insert
+as
+begin  
+	 if (select DepartmentId from inserted) not in( select DepartmentId from Department) 
+	 begin
+	    insert into Department values('009','学校') 
+	 end
+end  
+
+insert into People values('009','吕布','女',1000)
+
+select * from Department
+select * from People
+```
+
+--（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。
+
+```sql
+go
+create trigger tri_deletes
+on department after delete
+as
+begin
+	delete from People where DepartmentId=(select DepartmentId from deleted)
+end
+
+delete from Department where DepartmentName='市场部'
+
+select * from Department
+select * from People
+```
+
+--（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。
+
+```sql
+go
+create trigger tri_DeleteDeparyment
+on department after delete
+as
+begin
+    if (select DepartmentId from deleted) in  (select DepartmentId from Department) 
+	  begin
+	     print'删除失败'
+	  end
+    else
+      begin
+	     delete from People where DepartmentId=(select DepartmentId from deleted )	     
+	  end
+end
+
+drop trigger tri_DeleteDeparyment
+
+delete from Department where DepartmentName='市场部'
+```
+
+--（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
+
+```sql
+go
+create trigger tri_update
+on department after update
+as
+begin
+   update People set DepartmentId =(select DepartmentId from inserted) where DepartmentId=(select DepartmentId from deleted)
+end 
+
+update Department set DepartmentId ='110' where DepartmentId='001'
+
+select * from Department
+select * from People
+```
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