查询数据表中字段信息

SELECT  (case when a.colorder=1 then d.name else '' end) N'表名',  a.colorder N'字段序号',

 a.name N'字段名',

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

 (case when (SELECT count(*)  FROM sysobjects  WHERE (name in            (SELECT name           FROM sysindexes           WHERE (id = a.id) AND (indid in                     (SELECT indid                    FROM sysindexkeys                    WHERE (id = a.id) AND (colid in                              (SELECT colid                             FROM syscolumns                          

   WHERE (id = a.id) AND (name = a.name))))))) AND         (xtype = 'PK'))>0 then '√' else '' end) N'主键',  b.name N'类型',  a.length N'占用字节数',

 COLUMNPROPERTY(a.id,a.name,'PRECISION') as N'长度',  

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

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

 isnull(e.text,'') N'默认值',  isnull(g.PropValue,'') AS N'字段说明' --into ##tx

FROM  syscolumns  a left join systypes b on  a.xtype=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 sysproperties g on a.id=g.TableID AND a.colid = g.ColID  order by object_name(a.id),a.colorder

sql2008需创建视图：    sysproperties  

if exists (select 1 from sysobjects where name = 'sysproperties'and xtype = 'V')
begin
    DROP VIEW sysproperties
end
    GO
    CREATE VIEW sysproperties
    AS
    SELECT A.name As TableName,
    A.id As TableID,B.Name As ColName,B.colid As ColID,
    B.xtype As ColType,C.name As PropName,C.Value As PropValue
    FROM sysobjects As A INNER JOIN syscolumns As B ON A.id = B.id
    INNER JOIN sys.extended_properties As C ON C.major_id = A.id
    AND ( minor_id = B.colid)