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*/
全部评论

相关推荐

评论
1
1
分享

创作者周榜

更多
牛客网
牛客网在线编程
牛客网题解
牛客企业服务