| 范文 | 
		     SQL语句     描述:exhibitiononline表主键exhiid, exhibitor表有外键 exhid,对应表 exhibitiononline的主键exhiid;     exhibitiononline表---------> 一对多 <------------- exhibitor表     功能:查询出 exhibitiononline表中,exhiid存在于表 exhibitor中的所有数据,并根据 exhibitor表的exhid的数量排序     select * from exhibitiononline join     (select exhid,count(exhid) as s from exhibitor group by exhid) as t     on exhibitiononline.exhiid=t.exhid     order by t.s desc |