Question

How can I automatically generate a unique, random 6 digit number to insert into a column of a mysql table? The randomly generated number must not already exist in the column.

I am accessing mysql via php.

The table format is like so, with the random number going in the reqnumber column:

id,status,reqnumber

Answer 1

   function gen(){
    $num = rand(100000,999999);
    if($num == ifnumberinyourdatabase){
    gen();
    }
    return $num;
    }

You can also use recursive function here.
which check’s if number is your database if it is generate new one if not return the unique number

function gen(){
        $num = rand(100000,999999);
$query_idgetrs = "SELECT * FROM servicetbl where reqnumber = $num";
$idgetrs = mysql_query($query_idgetrs, $dbconnection) or die(mysql_error());
$row = mysql_num_rows($idgetrs);

        if($row >= 1){
        gen();
        }
        return $num;
        }