我有三个MySQL表，成功完成了一个查询，该查询会根据订单显示付款表上的一些计算。
问题： 在下面提到的查询连接条件是
时，需要从sku_mapping表中获取full_name列concat（＆＃39; f |＆＃39;，fk_orders.sku）= sku_mapping.prefix_sku
fk_orders
migratefk_payments
|order_item_id |order_id |Invoice_No |Invoice_No_Amt |Qty |Refund_Qty |Refund_Amount | sku
------------------------------------------------------------------------------------------------------
|1131231 |123 |F08OTTN16-1 |100 |1 | | |A3001
|1113138 |321 |F08OTTN16-2 |200 |2 |1 |200 |B1001
|1231231 |023 |F08OTTN16-3 |100 |1 |1 |100 |C2001
|1133138 |320 |F08OTTN16-4 |200 |2 | | |D8901
|1134231 |103 |F08OTTN16-5 |100 |1 | | |E6210
|1113538 |300 |F08OTTN16-6 |200 |2 | | |F1001
|1003538 |300 |F08OTTN16-7 |200 |2 | | |G9003
sku_mapping
|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
当前结果
|prefix_sku |full_name
-------------------
x|A3001 |Apple_Phone
f|B1001 |Belkin
f|C2001 |Cat_Access
f|D8901 |Dlink
f|E6210 |Eltron
f|F1001 |Flag
f|G9003 |gott
f|A3001 |Phone
a|B1001 |Belkin
a|C2001 |Cat_Access
a|D8901 |Dlink
a|E6210 |Eltron
a|F1001 |Flag
a|G9003 |gott
预期结果（需要来自sku_prefix表的full_name列）
|order_item_id |order_id |Invoice_No |Invoice_No_Amt |Qty |Refund_Qty |Refund_Amount |sku |SettledAmount |netAmount
------------------------------------------------------------------------------------------------------------------------------------
|1131231 |123 |F08OTTN16-1 |100 |1 | | |A3001 |80 |20
|1113138 |321 |F08OTTN16-2 |200 |2 |1 |200 |B1001 |150 |50
|1231231 |23 |F08OTTN16-3 |100 |1 |1 |100 |C2001 |50 |50
|1133138 |320 |F08OTTN16-4 |200 |2 | | |D8901 |300 |-100
|1134231 |103 |F08OTTN16-5 |100 |1 | | |E6210 |40 |60
|1113538 |300 |F08OTTN16-6 |200 |2 | | |F1001 |250 |-50
|1003538 |300 |F08OTTN16-7 |200 |2 | | |G9003 |0 |200
当前代码
|order_item_id |order_id |Invoice_No |Invoice_No_Amt |Qty |Refund_Qty |Refund_Amount |sku |SettledAmount |netAmount |full_name
-----------------------------------------------------------------------------------------------------------------------------------------------
|1131231 |123 |F08OTTN16-1 |100 |1 | | |A3001 |80 |20 |Apple_Phone
|1113138 |321 |F08OTTN16-2 |200 |2 |1 |200 |B1001 |150 |50 |Belkin
|1231231 |23 |F08OTTN16-3 |100 |1 |1 |100 |C2001 |50 |50 |Cat_Access
|1133138 |320 |F08OTTN16-4 |200 |2 | | |D8901 |300 |-100 |Dlink
|1134231 |103 |F08OTTN16-5 |100 |1 | | |E6210 |40 |60 |Eltron
|1113538 |300 |F08OTTN16-6 |200 |2 | | |F1001 |250 |-50 |Flag
|1003538 |300 |F08OTTN16-7 |200 |2 | | |G9003 |0 |200 |gott
答案 0 :(得分：1)
假设fk_orders有一个sku字段。
SELECT o.*, sk.full_name, (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
INNER JOIN sku_mapping sk ON o.sku = SUBSTRING_INDEX(prefix_sku,'|',-1)