连接表以查找对应的SQL列

Question

所以我想找到平均价格最高的类型，我这样做了：

SELECT MAX(MostExpensive) as HighestPrice, cdTitle
FROM (
    SELECT AVG(cdPrice) AS MostExpensive, cdTitle
    FROM `cd` GROUP BY cdGenre
) AS MostExpensiveAlbum

然而，我很快意识到我也需要得到艺术家的名字。我可以轻松地在SELECT语句中添加列，但它会发生，以便艺术家名称列位于另一个表中。

我如何JOIN我当前正在使用表cd选择此表artist并获取artName列以使其对应于最高的价格。

总之，我想找到平均价格最高的艺术家姓名

以下是我的两个表：

Answer 1

SELECT MAX(MostExpensive) as HighestPrice, cdTitle,artName
FROM (
    SELECT AVG(cd.cdPrice) AS MostExpensive, cd.cdTitle,artist.artname
    FROM `cd` inner join 'artist' on cd.artId = artist.artId GROUP BY cdGenre
) AS MostExpensiveAlbum

Answer 2

试试这个：

SELECT MAX(AvgPrice) As MaximumAveragePrice, ArtName As ArtistName
FROM
(
    SELECT AVG(cdPrice) As AvgPrice, ArtName
    FROM cd 
    INNER JOIN artist ON(cd.ArtId = artist.ArtId)
    GROUP BY ArtName
) As AvgPricePerArtName 
GROUP BY ArtName
HAVING AvgPrice = MAX(AvgPrice) 

注意代码直接写在这里，没有测试过。