查询SQLSERVER中系统表结构

Declare @TableName Varchar(20);
SET @TableName='数据库表名';

--SELECT TE.字段名+','
--FROM (
SELECT 
    (case when a.colorder=1 then d.name else '' end) 表名
    ,a.colorder 字段序号,a.name 字段名
    ,(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√' else '' end) 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) 主键
    ,b.name 类型,a.length 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) 允许空,isnull(e.text,'') 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  

    WHERE @TableName='' OR d.name=@TableName
                 
--) AS TE
--For XML PATH('')
--ORDER By TE.字段序号 ASC