Php 如何将3个表与2个表的数据相加

我有三张桌子。采购订单、货物接收、采购交易

***我的采购订单id显示为订单id。 1.我需要将所有数量的货物汇总到收货表中作为订单id。 2.其次，我需要采购交易表中的总金额作为订单id

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订单号
量
接收数量
单价
总金额
已付金额

加入计算所需总数的子查询

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