select a.name,a.system_type_id as type,
cast(isnull(e.[value],'') as nvarchar(100)) as remark
from sys.columns a inner join sys.objects c on a.object_id=c.object_id and c.type='u'
left join sys.extended_properties e on e.major_id=c.object_id
and e.minor_id=a.column_id
and e.class=1
where c.name='dbo.Admin'