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

对统计数据进行条件输出,需要先将order_num分组,才能分组统计成功

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