题解 | 返回每个订单号各有多少行数
返回每个订单号各有多少行数
https://www.nowcoder.com/practice/cf1f8d4a514d455aa0468718fb411f41
select
order_num,count(order_num) as order_lines
from
OrderItems
group by
order_num
order by
order_lines asc;
group by 记得要分组，不然只有一个结果
#面试之前应该如何准备？#
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