sql server 获取每1列的详细信息

            SELECT        表名=case   when   a.colorder=1   then   d.name   else   ''   end,        表说明=case   when   a.colorder=1   then   isnull(f.value,'')   else   ''   end,        字段序号=a.colorder,        字段名=a.name,        标识=case   when   COLUMNPROPERTY(   a.id,a.name,'IsIdentity')=1   then   '√'else   ''   end,        主键=case   when   exists(SELECT   1   FROM   sysobjects   where   xtype='PK'   and   name   in   (        SELECT   name   FROM   sysindexes   WHERE   indid   in(        SELECT   indid   FROM   sysindexkeys   WHERE   id   =   a.id   AND   colid=a.colid        )))   then   '√'   else   ''   end,        类型=b.name,        占用字节数=a.length,        长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'),        小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),        允许空=case   when   a.isnullable=1   then   '√'else   ''   end,        默认值=isnull(e.text,''),        字段说明=isnull(g.[value],'')        FROM   syscolumns   a        left   join   systypes   b   on   a.xusertype=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        left   join   sys.extended_properties   f   on   d.id=f.major_id   and   f.minor_id=0        --where   d.name='orders'         --如果只查询指定表,加上此条件        order   by   a.id,a.colorder