SQL - 無效的查詢，因爲它不包含在聚合函數或組合子句中

Question

我遇到了一些問題。我有3個表Product，Version,Date。

依賴關係：

• version.ProductId = Product.Id（有> = 1個版本的一個產品）
• Date.VersionId = Version.ID（一對一）

我想對產品 - 版本，其中DateVersion是Max（對於每個產品）

類似於：

Product 1 - 1.0 
Product 2 - 0.9 etc 

我試着用下面的查詢：

SELECT 
    productName, versionName 
FROM 
    (SELECT 
     p.Name AS productName, v.Name AS versionName, MAX(d.Date) AS ddate 
    FROM 
     Product AS p 
    INNER JOIN 
     Version AS v ON v.ProductId = p.Id 
    INNER JOIN 
     Date AS d ON d.VersionId = v.Id 
    WHERE 
     (d.Date < { fn CURDATE() }) 
    GROUP BY p.Name) AS prd 

但我得到一個錯誤：

Column Version.Name is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

如何處理這個問題？

Answer 1

您需要通過條款

SELECT productName, versionName 
FROM 
    (SELECT p.Name AS productName, v.Name AS versionName, MAX(d.Date) AS ddate 
    FROM Product AS p INNER JOIN Version AS v ON v.ProductId = p.Id 
    INNER JOIN VDate AS d ON d.VersionId = v.Id 
    WHERE (d.Date < { fn CURDATE() }) 
    GROUP BY p.Name, v.Name 
    ) AS prd 

編輯包括v.Name在一組。

select 
product.name, 
version.name 
    from 
product 
    inner join 
     version 
    on product.id = version.productid 
inner join 
    date on version.id = date.versionid 
inner join 
(
    select productid, MAX(date) as maxdate 
    from version 
     inner join date on version.id = date.versionid 
    group by productid 
) maxver 
    on date.date = maxver.maxdate 
    and version.productid = maxver.productid 

Answer 2

試試這個

SELECT p.Name AS productName, v.Name AS versionName 
FROM Product AS p INNER JOIN Version AS v ON v.ProductId = p.Id 
inner join 
(select VersionId,MAX(d.Date) from VDate group by Versionid) AS d 
on d.VersionId = v.Id 
WHERE and d.Date < { fn CURDATE() } 
GROUP BY p.Name,v.name