题解 | 从 Products 表中检索所有的产品名称以及对应的销售总数
select prod_name,sum(quantity) quant_sold from Products p join OrderItems oi on p.prod_id=oi.prod_id group by prod_name
select prod_name,sum(quantity) quant_sold from Products p join OrderItems oi on p.prod_id=oi.prod_id group by prod_name
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