【单选题】
A SELECT c_customer,SUM(c_price) FROM c_orders
GROUP BY c_customer
B SELECT c_customer,SUM(c_price) FROM c_orders
GROUP BY c_id
C SELECT c_customer,COUNT(c_price) FROM c_orders
GROUP BY c_customer
D SELECT c_customer,SUM(c_price) FROM c_orders
Order BY c_customer
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