select b.[value] from sys.columns a left join sys.extended_properties b on a.object_id=b.major_id 

and a.column_id=b.minor_id inner join sysobjects c on a.column_id=c.id 

and a.[name]='列名' and c.[name]='表名' 

SELECT 

表名=case when a.colorder=1 then d.name else '' end, 

表说明=case when a.colorder=1 then isnull(f.value,'') else '' end, 

字段序号=a.colorder, 

字段名=a.name, 

标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end, 

主键=case when exists(SELECT 1 FROM sysobjects where xtype='PK' and name in ( 

SELECT name FROM sysindexes WHERE indid in( 

SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid 

))) then '√' else '' end, 

类型=b.name, 

占用字节数=a.length, 

长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'), 

小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0), 

允许空=case when a.isnullable=1 then '√'else '' end, 

默认值=isnull(e.text,''), 

字段说明=isnull(g.[value],'') 

FROM syscolumns a 

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

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

left join 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='order_detail' --如果只查询指定表,加上此条件 

order by a.id,a.colorder