SELECT

                    字段名= convert(varchar(100), a.name),

                    表名= convert(varchar(50), d.name ),

                    类型= CONVERT(varchar(50),b.name),

                    库名= 'ServerModeXpoDemo',

                    字段说明=convert(varchar(50), isnull(g.[value],''))

                    FROM dbo.syscolumns a

                    left join dbo.systypes b on a.xusertype=b.xusertype

                    inner join dbo.sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties'

                    left join dbo.syscomments e on a.cdefault=e.id

                    left join sys.extended_properties g on a.id=g.major_id and a.colid=g.minor_id

                    left join sys.extended_properties f on d.id=f.major_id and f.minor_id=0

                    where d.name ='Car'

1.select column_name,data_type,character_maximum_length
from information_schema.columns
where table_name='TableName' and column_name='ColName'

2.information_schema.columns是系统视图，记录表的字段的相关信息。

获取SQL Server数据库中的表和字段描述

https://www.cnblogs.com/billqian/p/5045164.html

获取所有dbo表的扩展属性：

SELECT *　FROM fn_listextendedproperty (NULL, 'schema', 'dbo', 'table', default, NULL, NULL)

大概的结果：

objtype　　objname　　name 　　value

TABLE　　表名　　扩展属性名　　值

获取表的扩展属性：

select * from ::fn_listextendedproperty (null,'user','dbo','table','表名','column',null)

name=MS_Description 是系统提供的说明

获取字段属性，默认值等等：

SELECT * FROM INFORMATION_SCHEMA.COLUMNS

可以参考：http://www.cnblogs.com/chenxizhang/archive/2008/06/19/1225949.html