From 6733da3ec59a390619465e722768e63c5c0bd0ba Mon Sep 17 00:00:00 2001
From: smallkun <smallerkun@foxmail.com>
Date: Thu, 20 Mar 2025 19:11:16 +0800
Subject: [PATCH] Auto commit

---
 2207/触发器练习题.md | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/2207/触发器练习题.md b/2207/触发器练习题.md
index 77ae40a..ea36f30 100644
--- a/2207/触发器练习题.md
+++ b/2207/触发器练习题.md
@@ -128,11 +128,11 @@ BEFORE INSERT ON employee
 FOR EACH ROW
 BEGIN
 
-	IF NEW.salary < (
+	IF NEW.salary > (
 		SELECT j.max_salary
 		FROM job j
 		WHERE j.job_id = NEW.job_id
-	) OR NEW.salary > (
+	) OR NEW.salary < (
 		SELECT j.min_salary
 		FROM job j
 		WHERE j.job_id = NEW.job_id
@@ -153,6 +153,30 @@ VALUES(DEFAULT, '雷昊', 0, NOW(), 1, 1);
 
 创建一个触发器 `after_employee_insert`，在插入 `employee` 表数据之后，自动更新 `department` 表中的部门人数（假设 `department` 表新增一个字段 `employee_count`）。
 
+```sql
+ALTER TABLE department ADD employee_count INT UNSIGNED;
+
+DELIMITER $$
+DROP TRIGGER IF EXISTS after_employee_insert;
+CREATE TRIGGER after_employee_insert
+AFTER INSERT ON employee
+FOR EACH ROW
+BEGIN
+		UPDATE department d
+		SET d.employee_count = (
+			SELECT COUNT(*)
+			FROM employee e
+			WHERE e.dept_id = d.dept_id
+		);
+END $$
+DELIMITER ;
+
+INSERT INTO employee
+VALUES(DEFAULT, '雷昊', 60000.00, NOW(), 1, 1);
+```
+
+
+
 #### 练习题 3: 工资变更日志
 
 创建一个触发器 `after_employee_update`，在更新 `employee` 表的 `salary` 字段后，将变更记录插入到一个新的日志表 `salary_log` 中，记录员工 ID、旧工资、新工资和变更时间。