Create my table

<?php
    $db_host = "127.0.0.1";
    $db_username = "root";
    $db_password = "xyz";
    $db_name = "Test_Data";

    $connection = mysql_connect($db_host, $db_username, $db_password) or die(mysql_error());
    $db = mysql_select_db($db_name, $connection);

    for ($i = 1; $i <= 250; $i++) {
        $query = "INSERT INTO `Staff-Periods_Lookup` (`ID`, `Staff_ID`, `Period_ID`) VALUES ('$i', '1', '1')";
        mysql_query($query) or die ("Error in query: $query. ".mysql_error());
    }
?>