table test 表结构

id, chapterid, widx
60002   1   1
60004   1   1
60005   1   1
...
...
60006   1   5
60002   3   5
60005   3   4
60008   4   5

问题: 如何把每个id的最大chapterid和最大widx列出来.

思路:

1. 我先固定一个值

SELECT id, max(chapterid) as mid from pve_war where id in %s group BY id;
60002   3
60004   1
60005   1
60006   1

2.再把固定的表和原表作为联合查询( 条件为tmp.id=pve_war.id AND tmp.mc=pve_war.chapterid)
关键点为 1.要拿上表的max(chapterid)作为最终的chapteridm再找max(widx) 最后group by一下pve_war.id, tmp.mc

SELECT pve_war.id, tmp.mc, max(widx) FROM pve_war, (SELECT id, max(chapterid) as mc FROM pve_war GROUP BY id) AS tmp WHERE tmp.id=pve_war.id AND tmp.mc =pve_war.chapterid group by pve_war.id, tmp.mc;