Php 按日期从2个表中订购数据

我有3张表格：我的会员、论坛问题和论坛答案。 我的成员：

id | usr ..|..| follow | ....
 1 | Bob . |..|3,2,....|.....
 2 | John  |..|1,8,5...|.....
 3 | ......|..|........The "follow" column store the data in an array of followers id.<p>

论坛答复:

question_id | answer | a_name | idsender | datetime
 1 .........| answ 1 | Bob ...| 1 .......| 08:20
 2 ....... .| answ 2 | Bob ...| 1 .......| 07:20
 1 .........| answ 3 | John ..| 2 .......| 08:00

我有这个：

$foll = mysql_query("SELECT follow FROM myMembers WHERE id='$id' LIMIT 1");
  while ($row = mysql_fetch_array($foll)){
    $foll1 = explode(",", $row["follow"]);
                      }
foreach ($foll1 as $key => $value){
$displ = mysql_query("SELECT p.* FROM
(SELECT id, datetime, topic, name, idsender, 'question' AS TYPE FROM 
forum_question WHERE idsender = '$value' UNION
SELECT question_id, datetime, answer, a_name, idsender, 'answer' AS TYPE FROM
forum_answer  WHERE idsender = '$value')p
ORDER BY p.datetime DESC");
        while ($row = mysql_fetch_array($displ)){
                $type= $row['TYPE'];
                $id = $row["id"];
                $topic = $row["topic"];
                $name = $row["a_name"];
                $idsender = $row["idsender"];
                $datetime=$row['datetime'];
echo '<div>'. $name .', '. $type .', '. $topic.', '. $datetime.'</div>'";

我想要这个输出

Bob, answer, answ1, 8:20
**John,** answer, answ3, 8:00
Bob, question, foo q, 7:20
Bob, answer, answ2, 7:20
Bob, question, foo1 q, 7:10
**John,** question, foo2 q, 6:00

---

有可能吗？？谢谢

您可以使用group by作为名称和order by datetime。所以你的问题应该是

$displ = mysql_query("SELECT p.* FROM
(SELECT id, datetime, topic, name, idsender, 'question' AS TYPE FROM 
forum_question WHERE idsender = '$value' UNION
SELECT question_id, datetime, answer, a_name, idsender, 'answer' AS TYPE FROM
forum_answer  WHERE idsender = '$value')p
GROUP BY p.a_name ORDER BY p.datetime DESC")

---

为什么不直接按名称排序呢？通过datetime DESC添加订单就可以了。我假设您希望看到从后面发布的行到前面发布的行。谢谢您的回答。如果使用“分组方式”，循环将不起作用。它只显示每个用户的一条记录。我想做一个跟踪系统。我想按日期顺序限制这两个表中的最后10个条目。分组为数组中的每个用户显示一个条目，即使我有最近日期的帖子。您能参考此链接吗？Remux能给我你的邮箱号吗？你从哪里来？很好，伙计。我可以有你的邮件id，这样我们可以有接触，并做一些知识转移，如果需要的话。或者请邀请我在gmail聊天babuvino13@gmail.com

Bob, answer, answ1, 8:20
**John,** answer, answ3, 8:00
Bob, question, foo q, 7:20
Bob, answer, answ2, 7:20
Bob, question, foo1 q, 7:10
**John,** question, foo2 q, 6:00

$displ = mysql_query("SELECT p.* FROM
(SELECT id, datetime, topic, name, idsender, 'question' AS TYPE FROM 
forum_question WHERE idsender = '$value' UNION
SELECT question_id, datetime, answer, a_name, idsender, 'answer' AS TYPE FROM
forum_answer  WHERE idsender = '$value')p
GROUP BY p.a_name ORDER BY p.datetime DESC")