查询语句为：SELECT Top 20 ID,UserName,UserID,Subject,AddTime,Verific,LastReplayUser,LastReplayUserID,LastReplayTime,TotalReplay,BoardID,Hits,IsPic,IsTop,IsBest,PostType,AnnexExt,CategoryId,ShowScore From KS_GuestBook  Where deltf=0 and verific<>0 and datediff('d',AddTime,Now())<7 and boardid=17 and istop=0 ORDER BY IsTop Desc,LastReplayTime Desc<br>错误信息为：超出系统资源。<br>