将选择的数据分组在一起

Question

我需要找到一种方法将我的数据从我的选择查询中组合在一起。所以我输出哪些成员属于哪个团队的数据，但它只是将其全部推出，所以例如team1 - member1，team 2 - member2＆amp; team1 - member3所有3行team1 - member1, member3我需要它team2 - member 2＆amp; <?php $sql = " SELECT t.team_id, t.team_name, m.member_id, m.member_name FROM teams t LEFT JOIN team_members tm on t.team_id = tm.team_id LEFT JOIN members m on m.member_id = tm.member_id; "; $result = $conn->query($sql); if($result->num_rows > 0){ while($row = $result->fetch_assoc()){ echo 'team: <strong>' . $row["team_name"] . '</strong><br>'; echo 'member: <strong>' . $row["member_name"] . '</strong><br><br>'; } } ?>

case

Answer 1

一种简单的方法是首先按team_name排序结果。

SELECT t.team_id, t.team_name, m.member_id, m.member_name 
FROM teams t
LEFT JOIN team_members tm on t.team_id = tm.team_id
LEFT JOIN members m on m.member_id = tm.member_id
ORDER BY t.team_name ASC

在循环中检查团队是否与上一个团队不同。

if($result->num_rows > 0){
    $LastTeam=""; $NumTeamMembers=0;
    while($row = $result->fetch_assoc()){
        if($LastTeam != $row["team_name"] ){
           $LastTeam=$row["team_name"];
           if ($NumTeamMembers>0)
             echo '</strong><br><br>';
           echo 'team: <strong>' . $row["team_name"] . '</strong><br>';
           $NumTeamMembers=0;
        }
        if ($NumTeamMembers==0)
          echo 'members: <strong> ';
        else
          echo ', ';
        echo  $row["member_name"];
        $NumTeamMembers++;
    }
    echo '</strong><br><br>';
}