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
http://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 去重，count 统计*/
2022-04-05 17:43 硬件开发
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