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
关键词:
count()
group by
order by
select
order_num,count(order_num) order_lines
from
OrderItems
group by
order_num
order by
order_lines
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