thinkphp loops to query the data of table A, how to use the ID of table A to query the data of table B, how to add the data of table B to the loop and display it in the view

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<code>foreach ($six_month as $k => $v) {
    $six_upload = $upload->where("month_id={$vo['id']}")->find();
    $six_month[$k]['upload'] = $six_upload;
}
$this->assign('six_month', $six_month);</code>