选择列的两个最大值

Question

我有一个包含以下列的表

Store_ID, Item_ID, Sales_Amount

我需要检索每个商店的两个畅销商品。有人对这个问题有想法或建议吗？

Answer 1

这应该有效

SELECT mytable.Store_ID, mytable.Sales_Amount
FROM mytable
    LEFT JOIN mytable table2 ON mytable.Store_ID = table2.Store_ID 
    AND mytable.Sales_Amount <= table2.Sales_Amount
GROUP BY mytable.Store_ID, mytable.Sales_Amount HAVING COUNT(mytable.*) <= 2;