SQL语句查询重复字段并按数量排序

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

SQL语句查询重复字段并按数量排序,古老的榕树,5-wow.com

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