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Need assistance with join statement PHP/PDO

lawrence_dev asked
Last Modified: 2016-10-01
How do I correctly structure this join statement?

$query1 = $conn->query("SELECT * FROM `Outdoor_Invoices` LEFT JOIN `oc_order` USING (order_id) WHERE PONo = 'order_id'");

//LEFT JOIN `oc_url_alias` USING (query) WHERE product_id');

    while ($row1 = $query1->fetch(PDO::FETCH_ASSOC))
	$orderid = $row1['order_id'];
	$InvAmt = $row1['InvAmt'];
	$OrderTotal = $row1['total'];
	$Profit = ($total - $InvAmt);
$conn->query("UPDATE `Outdoor_Invoices` SET OrderTotal = $OrderTotal, Profit = $Profit WHERE PONo = '$orderid'");

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