From f36c8c5b38badca0d240d86829c6fa533b4e7434 Mon Sep 17 00:00:00 2001
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Date: Wed, 28 Sep 2022 12:39:45 +0800
Subject: [PATCH] =?UTF-8?q?=E9=99=88=E7=83=BD=E6=9D=B0=E5=BC=80=E5=A7=8B?=
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---
 ...75\346\225\260\344\275\234\344\270\232.md" |  0
 ...21\345\231\250\344\275\234\344\270\232.md" | 67 +++++++++++++++++++
 ...26\350\247\246\345\217\221\345\231\250.md" |  2 +-
 3 files changed, 68 insertions(+), 1 deletion(-)
 rename "45\346\235\216\346\266\233/\344\275\234\344\270\232/\345\207\275\346\225\260\344\275\234\344\270\232.md" => "45\346\235\216\346\266\233/\344\275\234\344\270\232/20220921\345\207\275\346\225\260\344\275\234\344\270\232.md" (100%)
 create mode 100644 "45\346\235\216\346\266\233/\344\275\234\344\270\232/20220927\350\247\246\345\217\221\345\231\250\344\275\234\344\270\232.md"

diff --git "a/45\346\235\216\346\266\233/\344\275\234\344\270\232/\345\207\275\346\225\260\344\275\234\344\270\232.md" "b/45\346\235\216\346\266\233/\344\275\234\344\270\232/20220921\345\207\275\346\225\260\344\275\234\344\270\232.md"
similarity index 100%
rename from "45\346\235\216\346\266\233/\344\275\234\344\270\232/\345\207\275\346\225\260\344\275\234\344\270\232.md"
rename to "45\346\235\216\346\266\233/\344\275\234\344\270\232/20220921\345\207\275\346\225\260\344\275\234\344\270\232.md"
diff --git "a/45\346\235\216\346\266\233/\344\275\234\344\270\232/20220927\350\247\246\345\217\221\345\231\250\344\275\234\344\270\232.md" "b/45\346\235\216\346\266\233/\344\275\234\344\270\232/20220927\350\247\246\345\217\221\345\231\250\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..1eb73b2
--- /dev/null
+++ "b/45\346\235\216\346\266\233/\344\275\234\344\270\232/20220927\350\247\246\345\217\221\345\231\250\344\275\234\344\270\232.md"
@@ -0,0 +1,67 @@
+```sql
+
+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 tri_d1
+on people after insert
+as
+	
+	if (select DepartmentId from inserted ) not in(select DepartmentId from Department)
+	begin
+	declare @Id varchar(20)
+	set	@Id=(select DepartmentId from inserted)
+	insert Department values(@Id,'新部门')
+	end
+	
+go
+
+insert People values ('009','赵云','男','10000')
+
+--（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 tri_de
+on department  after delete
+as
+	 delete from People where DepartmentId=(select DepartmentId from deleted)
+go
+
+delete from Department where DepartmentName='市场部'
+
+
+--（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 tri_d3
+on department  after delete
+as
+if  exists(select DepartmentId from People where DepartmentId  in (select DepartmentId from deleted) )
+	begin
+		rollback transaction
+	 end
+		 
+go
+
+delete from Department where DepartmentName='人事部'
+--（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
+go
+create trigger tri_d4
+on department  after update
+as
+	declare @Id varchar(10)= (select DepartmentId from inserted)
+	declare @Id2 varchar(10)=(select DepartmentId from deleted)
+
+	if update(DepartmentId)
+	begin
+		update People set DepartmentId=@Id from inserted
+		where People.DepartmentId=@Id2
+	 end
+		 
+go
+
+
+update Department set DepartmentId='008' where DepartmentId='001'
+```
+
diff --git "a/45\346\235\216\346\266\233/\347\254\224\350\256\260/220926\350\247\246\345\217\221\345\231\250.md" "b/45\346\235\216\346\266\233/\347\254\224\350\256\260/220926\350\247\246\345\217\221\345\231\250.md"
index 83c4c32..fd5e922 100644
--- "a/45\346\235\216\346\266\233/\347\254\224\350\256\260/220926\350\247\246\345\217\221\345\231\250.md"
+++ "b/45\346\235\216\346\266\233/\347\254\224\350\256\260/220926\350\247\246\345\217\221\345\231\250.md"
@@ -9,7 +9,7 @@ on table_name for each row  --行级触发器
 
 begin 
 
-​     tirgger_stmt;
+​     trigger_stmt;
 
 end 
 ```
-- 
Gitee