创建数据库
create database dbname
删除数据库
drop database dbname
创建新表(主键id自增长,从1开始,每次加1)create table tablename(id int identity(1,1) primary key,uname varchar(10))
修改表名
sp_rename tablename,newtablename
新增一列
alter table emp add pwd varchar(10)
删除一列(该列的值为null才能删除)
alter table s1 drop column pwd
修改列名
sp_rename 'tablename.colname',newcolname,'column'
sp_rename 's2.uname','name','column'
更新
update s2 set name='aaa' where id=1
删除行
delete from s2 where id=3
查看数据库下所有表
select * from sysobjects where type='U'
复制表结构和数据
select * into sys_department_1 from sys_department
只复制结构
法一:select * into b from a where 1 <>1
法二:select top 0 * into b from a