我有两个mysql表fk_orders＆amp; fk_payments。订单表列order_item id没有前缀'OI：'需要将其与order_item_id与'OI：'前缀的付款表相关联，需要汇总结算值+退款并按order_item_id与前缀
分组fk_orders
|order_item_id |order_id |Invoice_No |Invoice_No_Amt |Qty |Refund_Qty |Refund_Amount
------------------------------------------------------------------------------------------------
|1131231 |123 |F08OTTN16-1 |100 |1 | |
|1113138 |321 |F08OTTN16-2 |200 |2 |1 |200
|1231231 |023 |F08OTTN16-3 |100 |1 |1 |100
|1133138 |320 |F08OTTN16-4 |200 |2 | |
|1134231 |103 |F08OTTN16-5 |100 |1 | |
|1113538 |300 |F08OTTN16-6 |200 |2 | |
|1003538 |300 |F08OTTN16-7 |200 |2 | |
fk_payments
|order_item_id |order_id |Invoice_No |Invoice_No_Amt |Settlement_Value
-----------------------------------------------------------------------------------
|OI:1131231 |123 |F08OTTN16-1 |100 |40
|OI:1113138 |321 |F08OTTN16-2 |200 |150
|OI:1231231 |023 |F08OTTN16-3 |100 |-50
|OI:1133138 |320 |F08OTTN16-4 |200 |200
|OI:1134231 |103 |F08OTTN16-5 |100 |40
|OI:1113538 |300 |F08OTTN16-6 |200 |250
|OI:1131231 |123 |F08OTTN16-1 |100 |40
|OI:1133138 |320 |F08OTTN16-4 |200 |100
|OI:1113138 |321 |F08OTTN16-2 |200 |-200
查询结果如下所示
|order_item_id |order_id |Invoice_No |Invoice_No_Amt |Qty |Final_Settled_Amt
(refund_amount +
(sum of settled value group by order_item_id)
---------------------------------------------------------------------------------------
|OI:1131231 |123 |F08OTTN16-1 |100 |1 |80
|OI:1113138 |321 |F08OTTN16-2 |200 |2 |150
|OI:1231231 |023 |F08OTTN16-3 |100 |1 |50
|OI:1133138 |320 |F08OTTN16-4 |200 |2 |300
|OI:1134231 |103 |F08OTTN16-5 |100 |1 |400
|OI:1113538 |300 |F08OTTN16-6 |200 |2 |250
|OI:1003538 |300 |F08OTTN16-7 |200 |2 |0
答案 0 :(得分：0)
这看起来像invoice_no上的联接和一些聚合。我会这样做：
select o.*,
(coalesce(Refund_Amount, 0) + coalesce(sv, 0)) as SettledAmount,
(Invoice_No_Amt - coalesce(Refund_Amount, 0) - coalesce(sv, 0)) as netAmount
from fk_orders o left join
(select invoice_no, sum(Settlement_Value) as sv
from fk_payments
group by invoice_no
) p
on o.invoice_no = p.invoice_no;