php - MySQL:通过创建的随机组增加ID

Question

我希望我的表为每个创建的组自动增加一个 GroupId。这些组是从用户信息表中随机创建的。组信息表将随机组 ID(从 userInformation 表中选择)存储到其表中。到目前为止，我已经能够增加它。我只得到零

$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


//What I Have Tried
     //$query = "INSERT INTO groupInformation SELECT RegistrationId FROM (Select RegistrationId from userInformation order by RAND() LIMIT ".$GroupSize.")";
    //$query = "INSERT INTO groupInformation(RegistrationId) SELECT RegistrationId FROM (Select * from userInformation order by RAND() LIMIT ".$GroupSize.") AS j";




    $query = "INSERT INTO groupInformation(RandomGroupId,RegistrationId) SELECT randomRegistrationId,RegistrationId FROM (Select *,RAND() AS randomRegistrationId FROM userInformation ORDER BY randomRegistrationId LIMIT ".$GroupSize." ) AS j";
    $result = mysqli_query($con, $query) or die ("query failed " . mysqli_error($con));



}

mysqli_close($con);

这是我的表格:

这是我当前的输出:

我需要这些组有随机的 GroupId 来递增，例如 (1004 1003 1000) = 1(RandomGroupId), (1004, 1002, 1000) = 2(RandomGroupId), ...

Answer 1

试试这个方法。我希望它能帮助你:

$letters = 'abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'; $verificationText =substr(str_shuffle($letters), 0, 10);