正在加入多個表格以獲得所需的結果

Question

需要加入多個表格，其中顯示了每個客戶以及它所下的訂單的總價值。向客戶報告客戶編號和名稱以及爲訂單編號最高的的客戶的總價值。到目前爲止，我有：

select customer.customer_num, customer.customer_name, price as total_value 
from customer, orders, order_line, part 
where customer.customer_num = orders.customer_num 
and orders.order_num = order_line.order_num 
and order_line.part_num = part.part_num; 

這個範圍縮小，但現在我需要回答最初的問題，報告其客戶曾在部分表中找到價格最偉大的總和。

我只是不知道在哪裏放置這個語法？

customer.customer_num > sum(part.price) 

加入四個表後。

Answer 1

select customer.customer_num, customer.customer_name, price as total_value 
    from customer 
    join order on 
customer.customer_num = orders.customer_num 
join order_line on 
    orders.order_num = order_line.order_num 
    join part on 
    order_line.part_num = part.part_num where customer.customer_num >sum(part.price);