select a.id as aid,b.id as bid,a.city,a.cang,a.sid,a.time as atime,b.time as btime,a.price as aprice,b.price as bprice,a.pm as apm,b.pm as bpm from (select id,city,cang,sid,time,price,@rank:[email protected]+1 as pm from cai,(SELECT @rank:=0) B gro
Java实现顺序表算法:1:首先我们需要定义我们的接口,关于顺序表的一些基本的操作:顺序表中的操作都有增删改查. //List接口 public interface IList { //返回线性表的大小,即数据元素的个数. public int getSize(); //如果线性表为空返回 true,否则返回 false. public boolean isEmpty(); //判断线性表是否包含数据元素 e public boolean contains(Object e); //返回数据元素