我需要加入用户信息表和最后回复的聊天消息查询。用最后一次对话查询加入用户表
聊天表
mid | sender | receiver| text | created
1 | chrys | Paul| Hello | 2015-12-08 20:00
2 | chrys2 | Chrys | Hey | 2015-12-08 20:10
在过去的答复结果我使用该脚本:
mysql_query("
select *
from
chat
join
(select user, max(created) m , COUNT(*) AS msgCount
from
(
(select mid, receiver user, created
from chat
where sender='$login_session')
union
(select mid, sender user, created
from chat
where receiver='$login_session')
) t1
group by user) t2
on ((sender='$login_session' and receiver=user) or
(sender=user and receiver='$login_session')) and
(created = m)
order by created desc
");
我的问题是,我无法弄清楚如何加入一个用户信息表像如下:
id | username | photo_url | age | etcetera.....
有些想法? 我所需要的只是获取有关用户的信息,例如照片等的sendind消息,来自users_info表的年龄。
你能澄清你正在尝试做什么?你有一张用户表,你有一个消息表 - 当你的查询完成后,你想要什么信息? –
photo_url,年龄和在users_info表中找到的任何内容。 –
检查这是否有帮助。 http://stackoverflow.com/questions/41054587/join-multiple-row-column-mysql/41055339#41055339 –