From 37fccb1898740e78eecff9213d29c594011b3bec Mon Sep 17 00:00:00 2001
From: smallkun <smallerkun@foxmail.com>
Date: Fri, 21 Mar 2025 08:55:39 +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 490a2ec..9fbb58b 100644
--- a/2207/触发器练习题.md
+++ b/2207/触发器练习题.md
@@ -407,6 +407,29 @@ DELIMITER ;
 
 创建一个触发器 `after_employee_insert`，在插入 `employee` 表数据之后，自动更新一个统计表 `employee_statistics` 中的员工总数。
 
+```sql
+CREATE TABLE employee_statistics(
+	marking VARCHAR(20),
+	num INT
+);
+INSERT INTO employee_statistics()
+VALUES('count', 0);
+
+DELIMITER $$
+DROP TRIGGER IF EXISTS after_employee_insert;
+CREATE TRIGGER after_employee_insert
+AFTER INSERT ON employee
+FOR EACH ROW
+BEGIN
+	UPDATE employee_statistics
+	SET num = (SELECT COUNT(*) FROM employee)
+	WHERE marking = 'count';
+END $$
+DELIMITER ;
+```
+
+
+
 #### 练习题 13: 防止修改部门所在地
 
 创建一个触发器 `before_department_update`，在更新 `department` 表数据时，防止修改 `location` 字段。如果尝试修改，抛出错误。