1.4.8.sql

清华大学出版社出版的数据库系统教程附带的实验教程中所有的源代码

CREATE VIEW CS
(NO,SID,CID,SCORE)
AS SELECT CHOICES.NO, CHOICES.SID,CHOICES.CID,CHOICES.SCORE
FROM CHOICES
WHERE CHOICES.SCORE>=60
WITH CHECK OPTION