Php mySQL：为double select查询分配自动递增ID号

我正在创建一个程序，其中我从一个表中选择的数据被随机分组。来自每个组的RegistrationID号作为外键保存到另一个表中，并且每个组成员都被分配一个groupID，该groupID随创建的每个新组自动递增

$GroupSize = $_POST['groupsize'];

//Connect to the Server+Select DB
$con = mysqli_connect($host, $user, $password, $dbName) or die("Nope");

if (isset($_POST['create'])) {

//assign group id to groups created
//insert groupinformation to table from userInformation
      $query = "SELECT  RegistrationId FROM (Select * from userInformation order by RAND() LIMIT ".$GroupSize.") INTO groupInformation";
      $result = mysqli_query($con, $query) or die ("query failed" . mysqli_error($con));


//display group and information
    echo "<table border='1' >";
    echo "<tr><th>RegId</th><th>Name</th><th>Address</th><th>Email</th></tr>";
    while (($row = mysqli_fetch_row($result)) == true) {
        echo "<tr><td>$row[0]</td><td>$row[1]</td><td>$row[2]</td><td>$row[3]</td></tr>";
    }
    echo "</table>";

//if group is less than 2 create error message

}

mysqli_close($con);

这是我的表格

让GroupId自动递增，然后在groupInformation中再创建一列RandomGroupId，然后粘贴查询：

INSERT INTO groupInformation(RandomGroupId,RegistrationId) 
SELECT randomRegistrationId,RegistrationId 
FROM (Select *,RAND() AS randomRegistrationId 
      FROM userInformation ORDER BY randomRegistrationId LIMIT ".$GroupSize."
      ) AS j

让GroupId自动递增，然后在groupInformation中再创建一列RandomGroupId，然后粘贴查询：

INSERT INTO groupInformation(RandomGroupId,RegistrationId) 
SELECT randomRegistrationId,RegistrationId 
FROM (Select *,RAND() AS randomRegistrationId 
      FROM userInformation ORDER BY randomRegistrationId LIMIT ".$GroupSize."
      ) AS j

---

我获取{query failed Undeclared variable:groupInformation}尝试将此插入到groupInformation中选择RegistrationId FROM SELECT*FROM userInformation order by RAND LIMIT.$GroupSize。作为jIf，如果您只需要单列，请尝试将此插入groupInformationRegistrationId从SELECT*中选择RegistrationId从userInformation按兰德限制排序。$GroupSize。作为jSorry，您的两个屏幕截图属于同一个表。很抱歉，请尝试将此插入到groupInformationGroupId、RegistrationId选择randomRegistrationId、RegistrationId FROM SELECT*、Random AS randomRegistrationId FROM userInformation order by randomRegistrationId LIMIT.$GroupSize。作为jI get{query failed Undeclared variable:groupInformation}尝试将此插入到groupInformation中，从SELECT*中选择RegistrationId，从userInformation order by RAND LIMIT.$GroupSize。作为jIf，如果您只需要单列，请尝试将此插入groupInformationRegistrationId从SELECT*中选择RegistrationId从userInformation按兰德限制排序。$GroupSize。作为jSorry，您的两个屏幕截图属于同一个表。很抱歉，请尝试将此插入到groupInformationGroupId、RegistrationId选择randomRegistrationId、RegistrationId FROM SELECT*、Random AS randomRegistrationId FROM userInformation order by randomRegistrationId LIMIT.$GroupSize。当jI得到零作为RandomGroupId时，我得到零作为RandomGroupId。