查找具有相同商品编号的每行行的最低价格输入的详细信息 [英] Find details for minimum price entry for each group of rows with the same article number

问题描述

我读了很多关于这个的书，但是没有一个对我有用.有人可以帮忙吗?

I read a lot about this, but none worked for me. Can someone help?

我有一张大桌子，上面放着很多不同的文章(很多都用相同的EAN)，并且总是只需要最便宜的文章(按价格排序)并带有正确的AN:

I have a big table with a lot of different articles (a lot with same EAN) and need always only the cheapest one (sort by price) with the correct AN:

*art   price   an    ean
*Test |79,00|15770|0808736558136
*Test |85,00|k3238|0808736558136
*Test |68,00|r4850|0808736558136
*Test |65,00|a1117|0808736558136
*Test |78,00|t8619|0808736558136

期待这个:

*Test |65,00|a1117|0808736558136

推荐答案

SELECT B.*
  FROM BigTable AS B -- Why do SQL questions omit the table names so often?
  JOIN (SELECT EAN, MIN(Price) AS Price
          FROM BigTable
         GROUP BY EAN
       ) AS P
    ON B.EAN = P.EAN AND B.Price = P.Price
 ORDER BY B.EAN;

子查询查找每个EAN的最低价格；外部查询查找与EAN和该EAN的最低价格相匹配的详细信息.如果对于给定的EAN，有两个记录具有相同的最低价格，则将同时选择这两个记录.

The sub-query finds the minimum price for each EAN; the outer query finds the details that match the EAN and minimum price for that EAN. If there are two records with the same minimum price for a given EAN, both will be chosen.

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