添加列：alter table table_name add new_column data_type [interality_codition]
ALTER TABLE dbo.tb newColumn INT
删除列：alter table table_name drop column column_name
ALTER TABLE dbo.tb DROP COLUMN [column]
修改列名：sp_rename ‘tablename.colname‘,newcolname,‘column‘
sp_rename ‘tb.column‘,‘newcolumn‘, ‘column‘
修改列名的类型：alter table table_name alter column column_name
ALTER TABLE dbo.tb ALTER COLUMN [column] NVARCHAR(200)
原文：http://www.cnblogs.com/xiao-sheng/p/7101409.html