搜索后,我可以找到答案。这是我的问题
这是我尝试执行的操作,但未显示结果中的最新帖子
$result = mysql_query("SELECT * FROM berichten where ontvanger = '$session->username'
GROUP BY fromm ORDER BY date DESC");
while($row = mysql_fetch_array($result))
{
echo $row['fromm'];
echo $row['msg'];
echo $Row['date'];
}
我想对表fromm进行分组,当我这样做时,我想显示表fromm的最新信息,但显示旧信息
最佳答案
SELECT a.*
FROM berichten a
INNER JOIN
(
SELECT fromm, MAX(Date) Date
FROM berichten
GROUP BY fromm
) b ON a.fromm = b.fromm AND
a.date = b.date
WHERE a.ontvanger = '$session->username'
并且也可以写成
SELECT a.*
FROM berichten a
WHERE a.Date =
(
SELECT MAX(Date)
FROM berichten b
WHERE a.fromm = b.fromm
) AND
a.ontvanger = '$session->username'
关于php - mysql的group by和order by比显示最新的帖子,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/18945635/