获取sqlserver数据库字段所有信息

SELECT 
  表名   = CASE a.colorder WHEN 1 THEN c.name ELSE '' END, 
  序     = a.colorder, 
  字段名 = a.name, 
  标识   = CASE COLUMNPROPERTY(a.id,a.name,'IsIdentity') WHEN 1 THEN '√' ELSE '' END, 
  主键   = CASE 
    WHEN EXISTS ( 
      SELECT * 
      FROM sysobjects 
      WHERE xtype='PK' AND 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 
          ) 
        ) 
      ) 
    ) 
    THEN '√' 
    ELSE '' 
  END, 
  类型   = b.name, 
  字节数 = a.length, 
  长度   = COLUMNPROPERTY(a.id,a.name,'Precision'), 
  小数   = CASE ISNULL(COLUMNPROPERTY(a.id,a.name,'Scale'),0) 
    WHEN 0 THEN '' 
    ELSE CAST(COLUMNPROPERTY(a.id,a.name,'Scale') AS VARCHAR) 
  END, 
  允许空 = CASE a.isnullable WHEN 1 THEN '√' ELSE '' END, 
  默认值 = ISNULL(d.[text],''), 
  说明   = ISNULL(e.[value],'') 
FROM syscolumns a 
  LEFT  JOIN systypes      b ON a.xtype=b.xusertype 
  INNER JOIN sysobjects    c ON a.id=c.id AND c.xtype='U' AND c.name<>'dtproperties' 
  LEFT  JOIN syscomments   d ON a.cdefault=d.id 
  LEFT  JOIN sys.extended_properties e ON   a.id= e.major_id AND a.colid = e.minor_id
ORDER BY c.name, a.colorder