又一个SQL问题
select count(customerid) as '订单总共条数',customerid as '消费者' from orders where customerid in(select customerid from customers where city='Madrid') GROUP BY customerid
答:贵阳市实验小学旁边西西弗书店楼上——六楼有一个乒乓球训练馆,应该需要教练。 帮助他人,快乐自己。若我的回答对您有用,请将其设为“好评”,谢谢!详情>>
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