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

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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

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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