天空

摘要： use tempdb;go--科目表if object_id('dbo.subject') is not nulldrop table dbo.subject;gocreate table subject(sid int identity(1,1) not null primary key ,sname varchar(1000));go--学生表if object_id('dbo.student') is not nulldrop table dbo.studentgocreate table dbo.student(stuid char(10) not nu 阅读全文