publish the second courseware and lab02

README.md

@@ -6,10 +6,6 @@
 坐地日行八万里，巡天遥看一千河。<br/>
 牛郎欲问瘟神事，一样悲欢逐逝波。<br/>
 
-## textbook
-Avi Silberschatz, Henry F. Korth, S. Sudarshan. **Database System Concepts 6th Edition**. McGraw-Hill, ISBN 0-07-352332-1
-<img src="./docs/DatabaseSystemConcepts6Cover.jpg" width="100" alt="Database System Concepts 6th Edition"/>
-
 ## coursewares
 
 ### Lecture 3~4
@@ -28,3 +24,13 @@ see [labs/README.md](./labs/README.md)<br/>
 ### Lab1: prepare for database labs
 [lab01 Prepare the basic environment](./labs/lab01DbSystemPrepareStudent.pdf)
 
+## textbook
+Avi Silberschatz, Henry F. Korth, S. Sudarshan. **Database System Concepts 6th Edition**. McGraw-Hill, ISBN 0-07-352332-1
+<img src="./docs/DatabaseSystemConcepts6Cover.jpg" width="100" alt="Database System Concepts 6th Edition"/>
+
+## poem for digital age
+赞数字文明 2017<br/>
+文明初叶几时真，造化阴阳始幻尘。<br/>
+书简成山薪火旺，零壹遁迹智能春。<br/>
+有形百载多将朽，数字千年总是新。<br/>
+懵懂蹒跚别旧日，一朝奋起笑前津。<br/>