题解 | #从表中检索产品名称以及销售总数#
select prod_name, (select sum(quantity) from OrderItems oi where oi.prod_id=p.prod_id group by oi.prod_id ) quant_sold from Products p
select prod_name, (select sum(quantity) from OrderItems oi where oi.prod_id=p.prod_id group by oi.prod_id ) quant_sold from Products p
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