create table [테이블명](id int,name varchar(20));
alter table [테이블명] add [컬럼명][타입] [옵션];
ex) alter table [테이블명] add [컬럼명] varchar(100) not null default '0';
alter table [테이블명] drop [컬럼명];
alter table [테이블명] change [컬럼명][변경할컬럼명] varchar(12);
alter table [테이블명] modify [컬럼명] varchar(14);
alter table [테이블명] rename [변경할테이블명];
drop table [테이블명];