增加一列: alter table emp4 add test varchar2(10); 修改一列: alter table emp4 modify test varchar2(20); 删除一列: alter table emp4 drop column test; 这里要注意几个地方,首先,增加和修改列是不需要加关键字COLUMN,否则会报错ora-0090
vba excel排序 People are lazy! Shocking, I know, but who wants to click twice in Excel, if you can do the same thing by only clicking once? 人们很懒! 我知道令人震惊,但是如果您只单击一次就可以做同样的事情,谁想在Excel中单击两次? Dave P