SELECT title,catname,e.eid,exid,IF(exdate,exdate,edate) edate,summary, 
		IF(x.reserved,x.reserved,o.reserved)/IF(expersons,expersons,persons)*100, closetime FROM f1570c_eguide e LEFT JOIN f1570c_eguide_category c ON e.topicid=c.catid LEFT JOIN f1570c_eguide_opt o ON e.eid=o.eid LEFT JOIN f1570c_eguide_extent x ON e.eid=eidref 
WHERE ((edate BETWEEN 826902000 AND 827679600 AND exdate IS NULL) 
  OR exdate BETWEEN 826902000 AND 827679600) 
AND IF(exdate,exdate,edate) BETWEEN 826902000 
AND 827679600 AND status=0  ORDER BY edate