坐地铁回家路上忽然想起,三甲排名可能为多个,只取三名岂不荒谬.不信请看下面数据: create table tb_score( id number(4,0) primary key, name nvarchar2(20) not null, score integer not null) insert into tb_score values('','Andy',''); insert into tb_score values('','Bill',''); insert into tb_scor…