diff --git a/codes/mysql/trigger_demo.sql b/codes/mysql/trigger_demo.sql
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+/**
+ * Mysql 触发器（TRIGGER）创建、使用示例
+ * @author Zhang Peng
+ * @date 2018/5/2
+ */
+
+#############################################################
+# 运行本例的预置操作
+#############################################################
+
+-- 新建数据表 user
+DROP TABLE IF EXISTS `user`;
+CREATE TABLE `user` (
+  `id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'Id',
+  `username` varchar(64) NOT NULL DEFAULT 'default' COMMENT '用户名',
+  `password` varchar(64) NOT NULL DEFAULT 'default' COMMENT '密码',
+  `email` varchar(64) NOT NULL DEFAULT 'default' COMMENT '邮箱',
+  PRIMARY KEY (`id`)
+) COMMENT='用户表';
+
+-- 新建数据表 user_history
+DROP TABLE IF EXISTS `user_history`;
+CREATE TABLE `user_history` (
+  `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `user_id` INT(10) UNSIGNED NOT NULL DEFAULT 0 COMMENT '用户ID',
+  `operate_type` VARCHAR(64) NOT NULL DEFAULT 'default' COMMENT '操作类型',
+  `operate_time` VARCHAR(64) NOT NULL DEFAULT 'default' COMMENT '操作时间',
+  PRIMARY KEY (`id`)
+) COMMENT='用户记录表';
+
+#############################################################
+# 创建触发器
+#############################################################
+
+-- 删除触发器
+DROP TRIGGER IF EXISTS `trigger_insert_user`;
+
+-- 创建触发器
+DELIMITER $
+CREATE TRIGGER `trigger_insert_user`
+AFTER INSERT ON `user`
+FOR EACH ROW
+BEGIN
+    INSERT INTO `user_history`(user_id, operate_type, operate_time)
+    VALUES (NEW.id, 'add a user',  now());
+END $
+DELIMITER ;
+
+-- 查看触发器
+SHOW TRIGGERS;
+
+#############################################################
+# 测试
+#############################################################
+
+INSERT INTO `user`(username, password, email)
+VALUES ('admin', 'admin', 'xxxx@163.com');
+SELECT * FROM user_history;