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)

sql 增删改列名