摘要:
今天学习SqlServer2005 sql语句,在网上找了不少,但是在测试的时候,发现了不少问题。我把有问题的进行重新测试,改过来。修改结果如下:use testgoalter table Teachers add address varchar(100)goalter table Teachers alter column address varchar(20)godelete from teachersgo--增加主键alter table Teachers add constraint PK_TeacherID primary key(teacherID)go--删除主键alter t. 阅读全文