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
#sql中存在聚合函数,其余的字段要进行分组 select order_num,count(order_num) order_lines from OrderItems group by order_num order by order_lines
返回每个订单号各有多少行数
https://www.nowcoder.com/practice/cf1f8d4a514d455aa0468718fb411f41
#sql中存在聚合函数,其余的字段要进行分组 select order_num,count(order_num) order_lines from OrderItems group by order_num order by order_lines
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