sqlServer查询表信息与字段信息

SELECT  
(case when a.colorder=1 then d.name else '' end) as 表名,--如果表名相同就返回空 
     a.colorder as 字段序号, 
     a.name as 字段名, 
     (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) as 标识, 
     (case when (SELECT count(*) FROM sysobjects--查询主键 
                     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) as 主键,--查询主键END 
b.name as 类型, 
a.length as 占用字节数, 
COLUMNPROPERTY(a.id,a.name,'PRECISION') as  长度, 
isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数, 
(case when a.isnullable=1 then '√'else '' end) as 允许空, 
isnull(e.text,'') as 默认值, 
isnull(g.[value],'') AS 字段说明  
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 sys.extended_properties g 
on a.id=g.major_id AND a.colid = g.minor_id  
order by a.id,a.colorder