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2208/天天乐学考试答案/MySQL练习（一）.md

@@ -60,6 +60,24 @@ WHERE money >= 5000 AND money <= 8000;
 
 #6
 
+#9 触发器
+DELIMITER $$
+DROP TRIGGER IF EXISTS tri_updateGroup;
+CREATE TRIGGER tri_updateGroup
+BEFORE UPDATE ON t_employee
+FOR EACH ROW
+BEGIN
+	IF NEW.age != OLD.age THEN
+		IF NEW.age<30 THEN
+			SET NEW.groups = '青年';
+		ELSEIF NEW.age<50 THEN
+			SET NEW.groups = '中年';
+		ELSE
+			SET NEW.groups = '老年';
+		END IF;
+	END IF;
+END $$
+DELIMITER ;
 
 #10 存储过程
 DELIMITER $$ #改变代码结束符