diff --git a/2208/天天乐学考试答案/MySQL练习（一）.md b/2208/天天乐学考试答案/MySQL练习（一）.md
index bdf0eef..acbec3b 100644
--- a/2208/天天乐学考试答案/MySQL练习（一）.md
+++ b/2208/天天乐学考试答案/MySQL练习（一）.md
@@ -322,5 +322,23 @@ UPDATE test1 t1, (
 )t2
 SET t1.tname = t2.str
 WHERE t1.tname = t2.tname;
+
+#5
+SELECT *
+FROM tb_courses c
+ORDER BY c.cid+0
+LIMIT 4, 11;
+
+#6
+SELECT s.stuname, TIMESTAMPDIFF(YEAR,s.birthday,'2023-12-01')
+FROM tb_students s
+WHERE TIMESTAMPDIFF(YEAR,s.birthday,'2023-12-01') BETWEEN 30 AND 40;
+
+#7
+
+
+#8
+
+
 ```