select top {$Param(0)} WHQ_PhotoName from CH_WeekHangQingTop10 where ID ={$Param(1)} order by WHQ_CXOrder asc

这个自定义的sql标签里面，  {$Param(0)} 是什么意思？

                                 where ID ={$Param(1)} order by WHQ_CXOrder asc 这个条件何解？