可以在一列php中显示来自mysql的多个值

我试图显示一个表，该表在给定提案的一列中有多个“标记”，而不是在每个提案的每个标记中创建新行。 有可能做到这一点吗？如果是，怎么做？我不知道该采取什么办法

当前该表如下所示：

正如您所看到的，它创建了一个新行，因为提案有多个标记。我想要它，这样标签栏就有了与提案相关的所有标签（最多只有3个），比如人工智能、神经网络、贝叶斯。而不是为每一个单独的行

php文件是：

<?php

  include "db_conx.php";

  try {

    $db_conx = new PDO("mysql:host=$mysql_hostname;dbname=$mysql_dbname", $mysql_username, $mysql_password);

    $db_conx->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $stmt = $db_conx->prepare('SELECT DISTINCT p.proposal_id, p.proposal_title, p.description, c.course_title, t.tag_title  FROM proposal p 
LEFT JOIN proposal_tags pt on pt.proposal_id = p.proposal_id 
LEFT JOIN tag_details t on t.tag_code = pt.tag_code 
LEFT JOIN course_details c on c.course_code = p.course_code');
    $stmt->execute();
    $proposals = $stmt->fetchAll(PDO::FETCH_ASSOC);
  }
  catch(Exception $e)
  {
    die ("Could not connect to the database $mysql_dbname :" . $e->getMessage());
  }
  ?>


  <div class="btn-group-vertical btn-lg pull-right" role="group">

    <div class="btn-group" role="group">
      <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#searchCModal" data-id="#">Search By Course</button>
    </div><p/>
    <div class="btn-group" role="group">
      <button type="button" class="btn btn-success" data-toggle="modal" data-target="#searchLModal" data-id="#">Search By Lecturer</button>
    </div>
  </div>
  <!-- <div class="container">
    <div class = "container-fluid"> -->
      <h4><center>View All Proposals</center></h4>
      <div class = "container container-fluid"id = "table_container" style="width:auto; margin-top:50px;" class="mainbox col-md-6">
        <div class="row clearfix">
          <div class="col-md-12">
            <table class="table table-bordered table-hover" id="tab_logic">
              <thead>
                <tr >
                  <th class="text-center">
                    Proposal ID
                  </th>
                  <th class="text-center">
                    Proposal Title
                  </th>
                  <th class="text-center">
                    Proposal Description
                  </th>
                  <th class="text-center">
                    Course
                  </th>
                  <th class="text-center">
                    Tags
                  </th>
                </tr>
              </thead>
              <tbody>
                <!-- populating the table with information from mysql database -->
                <?php foreach ($proposals as $proposal) {
                  echo "<tr><td>";
                  echo $proposal['proposal_id'];
                  echo "</td><td>";
                  echo substr($proposal['proposal_title'],0,30) ."...";
                  echo "</td><td>";
                  echo substr($proposal['description'],0,50) ."...";
                  echo "</td><td>";
                  echo $proposal['course_title'];
                  echo "</td><td>";
                  echo $proposal['tag_title'];
                  echo "</td><td>";
                  echo '<p data-placement="top"
                  data-toggle="tooltip"
                  style="margin-left:5px" 
                  title="Full View">';
                  echo '<button class="btn btn-info btn-xs" 
                  data-title="View" 
                  data-toggle="modal" 
                  data-id="'; 
                  echo $proposal['proposal_id']; 
                  echo '" data-proposal="'; 
                  echo substr($proposal['proposal_title'],0,30) ."...";
                  echo '" data-desc="'; 
                  echo substr($proposal['description'],0,50) ."...";
                  echo '" data-course="'; 
                  echo $proposal['course_title'];
                  echo '" data-tag="'; 
                  echo $proposal['tag_title'];
                  echo '" data-target="#viewModal">';
                  echo '<span class="glyphicon glyphicon-eye-open" />';
                  echo '</button></p>';

                  echo "</td>";
                  echo "</td><td>";
                  echo '<p data-placement="top"
                  data-toggle="tooltip"
                  style="margin-left:5px"
                  title="Add to Favourites">';
                  echo '<button class="btn btn-success btn-xs" 
                  data-title="Favourites" 
                  data-toggle="modal" 
                  data-id="'; 
                  echo $proposal['proposal_id']; 
                  echo '" data-proposal="'; 
                  echo substr($proposal['proposal_title'],0,30) ."...";
                  echo '" data-desc="'; 
                  echo substr($proposal['description'],0,50) ."...";
                  echo '" data-course="'; 
                  echo $proposal['course_title'];
                  echo '" data-tag="'; 
                  echo $proposal['tag_title'];
                  echo '" data-target="#favouritesModal">';
                  echo '<span class="glyphicon glyphicon-heart" />';
                  echo '</button></p>';

                  echo "</td>";
                  echo "</td><td>";
                  echo '<p data-placement="top"
                  data-toggle="tooltip"
                  style="margin-left:5px"
                  title="Print">';
                  echo '<button class="btn btn-primary btn-xs" 
                  data-title="Print" 
                  data-toggle="modal" 
                  data-id="'; 
                  echo $proposal['proposal_id']; 
                  echo '" data-proposal="'; 
                  echo $proposal['proposal_title']; 
                  echo '" data-desc="'; 
                  echo $proposal['description']; 
                  echo '" data-course="'; 
                  echo $proposal['course_title'];
                  echo '" data-tag="'; 
                  echo $proposal['tag_title'];
                  echo '" data-target="#printModal">';
                  echo '<span class="glyphicon glyphicon-print" />';
                  echo '</button></p>';
                  echo "</tr>"; }
                  ?>
                </tbody>
              </table>
            </div>
          </div>
        </div>

按路线搜索

按讲师搜索
查看所有提案
提案ID
提案标题
提案说明
课程
标签

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任何帮助都将不胜感激。谢谢

您需要

分组\u CONCAT（t.tag\u title）

然后

按p.proposal\u id分组

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您可以连接列值，谢谢。我已经成功地将组设置为“按”，但由于连接，我对标记标题有问题。最简单的方法是什么？