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;
group by 也好,order by 也好 都不能直接写在where 后面
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;
group by 也好,order by 也好 都不能直接写在where 后面
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