From 95aa201cf49fd485a106059bd67a9949b28c9096 Mon Sep 17 00:00:00 2001
From: smallkun <smallerkun@foxmail.com>
Date: Thu, 20 Mar 2025 19:37:29 +0800
Subject: [PATCH] Auto commit

---
 2207/触发器练习题.md | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/2207/触发器练习题.md b/2207/触发器练习题.md
index 232d692..03e6ac6 100644
--- a/2207/触发器练习题.md
+++ b/2207/触发器练习题.md
@@ -214,6 +214,29 @@ WHERE e.emp_id = 1;
 
 创建一个触发器 `before_employee_delete`，在删除 `employee` 表数据之前，将被删除的员工数据插入到一个备份表 `employee_backup` 中。
 
+```sql
+CREATE TABLE employee_backup AS
+SELECT *
+FROM employee
+WHERE 0;
+
+DELIMITER $$
+DROP TRIGGER IF EXISTS before_employee_delete;
+CREATE TRIGGER before_employee_delete
+BEFORE DELETE ON employee
+FOR EACH ROW
+BEGIN
+		INSERT INTO employee_backup()
+		VALUES(OLD.emp_id, OLD.emp_name, OLD.salary, OLD.hire_date, OLD.dept_id, OLD.job_id);
+END $$
+DELIMITER ;
+
+DELETE FROM employee
+WHERE emp_id = 20;
+```
+
+
+
 #### 练习题 5: 自动设置默认职位
 
 创建一个触发器 `before_employee_insert`，在插入 `employee` 表数据时，如果未指定 `job_id`，则自动将其设置为 `job` 表中的默认职位（假设默认职位的 `job_id` 为 1）。