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.xusertypeinner join sysobjects d on a.id=d.id  and  d.xtype='U' and  d.name<>'dtproperties'left join syscomments eon a.cdefault=e.idleft join sys.extended_properties gon a.id=g.major_id AND a.colid = g.minor_id  order by a.id,a.colorder