7.4.1.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

USE School
GO
IF EXISTS (SELECT name FROM sysindexes WHERE name = 'IX_sid') 
DROP INDEX CHOICES.IX_sid
GO
IF EXISTS (SELECT name FROM sysindexes WHERE name = 'IX_tid') 
DROP INDEX CHOICES.IX_tid
GO