alter table article drop [列名]
来删队列
但在Sql server数据库，如果这个列有默认值，这样删除列会报错，这时要删除列的默认值
declare @name varchar(20)
select @name=b.name from syscolumns a,sysobjects b where a.id=object_id('[表名]') and b.id=a.cdefault and a.name='[列名]' and b.name like 'DF%'
exec('alter table article drop constraint '+@name)
alter table [表名] drop column [列名]
select @name=b.name from syscolumns a,sysobjects b where a.id=object_id('[表名]') and b.id=a.cdefault and a.name='[列名]' and b.name like 'DF%'
exec('alter table article drop constraint '+@name)
alter table [表名] drop column [列名]
其它：
删除索引时Access为：drop index indexName on tableName
sql 为：drop index tableName.indexName
mssql给表添加主索引：alter table tablename add constraint [DF_tablename] default (1) for column
建带主索引表：create table tablename (id int identity(1,1) not null constraint PK_tablename primary key, column1 nvarchar(250) null)