how can I join 3 table with 2 table data sum - php

Question

I have 3 table. purchase_order, goods_receive, purchase_transaction.
*** My purchase_order id is show as order_id.
1. I need sum all Quantity form goods_receive table as order id.
2. secondly I need sum amount form purchase_transaction tabel as order id.
see my attachment image for more clear >>
<?php
include("db.php");
$sqlnew="SELECT purchase_order.id , purchase_order.quantity,
purchase_order.unit_price, purchase_order.total_amount,
sum(goods_receive.quantity) as qua , sum(purchase_transaction.amount) as amount
FROM purchase_order
JOIN goods_receive ON purchase_order.id = goods_receive.order_id
JOIN purchase_transaction ON purchase_order.id = goods_receive.order_id
GROUP BY goods_receive.order_id";
$resultnew=mysql_query($sqlnew);
?>
<table class="table table-bordered data-table" border="1">
<thead>
<tr>
<th>Order ID</th>
<th>Quantity</th>
<th> Receive Quantity</th>
<th>Unit Price</th>
<th>Total Amount</th>
<th>Paid Amount</th>
</tr>
</thead>
<tbody>
<?php
while($rows=mysql_fetch_array($resultnew)){
?>
<tr class="gradeX">
<td><a href="purchase_order_single_details.php?id=<?php echo $rows['id']; ?>"><?php echo $rows['id']; ?></td>
<td><?php echo $rows['quantity']; ?></td>
<td><?php echo $rows['qua']; ?></td>
<td><?php echo $rows['unit_price']; ?></td>
<td><?php echo $rows['total_amount']; ?></td>
<td><?php echo $rows['amount']; ?></td>
</tr>
<?php
}
?>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
<!--Footer-part-->
Please help me...

Answer 1

Join with subqueries that calculate the totals you want
SELECT po.order_id, po.quantity, gr.quantity AS receive_quantity,
po.unit_price, po.total_amount, pt.amount AS paid_amount
FROM purchase_order AS po
JOIN (SELECT order_id, SUM(quantity) AS quantity
FROM good_receive
GROUP BY order_id) AS gr ON gr.order_id = po.order_id
JOIN (SELECT order_id, SUM(amount) AS amount
FROM purchase_transaction
GROUP BY order_id) AS pt ON pt.order_id = po.order_id