SQL Server 2008获取一个表的字段，类型，长度，是否主键，是否为空，注释等信息

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 parent_obj=a.id 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='TableName'    --如果只查询指定表,加上此条件
order by a.id,a.colorder

　　OR

select 
 c.name as cname,c.prec AS Prec,c.isnullable AS isnullable,
 [IsPk]=case when exists(SELECT 1 FROM sysobjects where xtype='PK' and parent_obj=c.id and name in (
		SELECT name FROM sysindexes WHERE indid in(SELECT indid FROM sysindexkeys WHERE id = c.id AND colid=c.colid))) then '1' else '0' end,
[defaultval]=isnull(e.text,''),
t.name as tname ,(select value from sys.extended_properties as ex where ex.major_id = c.id and ex.minor_id = c.colid) as notes 
from 
 syscolumns as c inner join sys.tables as ta on c.id=ta.object_id 
 inner join  (select name,system_type_id from sys.types where name<>'sysname') as t on c.xtype=t.system_type_id 
 left join syscomments e on c.cdefault=e.id
where 
 ta.name='TestTb' order by c.colid