问一个SQL查询 select op from user group by userid having MAX(time) 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 SELECT userid, username, op, time FROM user GROUP BY userid ORDER BY time DESC; SELECT userid, username, op, time FROM user GROUP BY userid ORDER BY time DESC;试试这个 select * from user where userid in (select userid from user where max(time)) 应该是这样select userid,username,time,op from user where (userid,time) in (select userid,max(time) from user group by userid); 求助一个判断图片格式的自定义函数 求一个php的超级url 验证 上海交大昂立PHP Web2.0网站开发培训全市最低价 请问这个php问题是apach引起的吗? set_time_limit问题 请问怎么用正则表达式表示出“ - ”? apache服务器下PHP4的安装与设置.....在线等待。。。。 看看这个吧!!! 怎样实现发断消息? 求助js在360安全浏览器IE8兼容模式下的问题 小弟问一个函数执行的次数及效率(不明白函数) 这个错误提示是什么原因导致的,如何解决!
FROM user
GROUP BY userid
ORDER BY time DESC;
FROM user
GROUP BY userid
ORDER BY time DESC;
试试这个
select userid,username,time,op from user where (userid,time) in
(select userid,max(time) from user group by userid);