[英]Advice on my relational database query
这只是与相关表的简单内连接
select d.product_id, d.product_name
from invoce as a
inner join order as b on a.order_no = b.order_no
inner join customer as c on a.cust_no = c.cust_no
inner join product as d on b.product_id = d.product_id
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