题解 | #返回每个订单号各有多少行数#
https://www.nowcoder.com/practice/cf1f8d4a514d455aa0468718fb411f41
SELECT order_num,COUNT(*) AS order_lines
FROM OrderItems
GROUP BY order_num
ORDER BY order_lines;
FROM OrderItems
GROUP BY order_num
ORDER BY order_lines;
https://www.nowcoder.com/practice/cf1f8d4a514d455aa0468718fb411f41
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