在表中怎么查询订单表中每件产品的订购总和？

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在表中怎么查询订单表中每件产品的订购总和？

select 产品ID, SUM(数量) as 订购总和 from P_order group by 产品ID;

select 产品ID, SUM(数量) as 订购总和 from P_order group by 产品ID;