sql - Group By 子句导致错误

Question

所以这里是上下文:开发 ASP.NET MVC 4 Web 应用程序，我的数据库中有一个表 产品分配它由 2 个外键组成:一个来自我的表 产品展示 另一个来自表 人 .我还有一张 table ，车辆 其中包含表 的外键产品展示

我想选择按产品分组的分配及其信息(一个产品可以多次分配)。这是我的存储过程:

ALTER PROCEDURE GetAllVehicles

AS

BEGIN

    SET NOCOUNT ON 

    SELECT 

    p.FirstName,
    p.LastName,
    pa.EndDate,
    pr.PurchaseDate,
    pr.SerialNumber,
    pr.CatalogPrice,
    v.PlateNumber,
    v.FirstCirculationDate,
    V.FirstDrivingTax,
    v.UsualDrivingTax

    FROM bm_ProductAllocations AS pa

    INNER JOIN bm_Persons AS p ON pa.Id_Person = p.Id_Person
    INNER JOIN bm_Products AS pr ON pa.Id_Product = pr.Id_Product
    INNER JOIN bm_Vehicles AS v ON pr.Id_Product = v.Id_Product

    GROUP BY pa.Id_Product

END

但是，Group By 子句生成错误: Column 'bm_Persons.FirstName' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.我正在使用 Visual Studio 2010。

我是 SQL 的新手，所以我不知道发生了什么。

Answer 1

您分组的字段，您需要使用聚合 sum , max等或者您需要在子句中包含列，请参阅以下链接:SQL Group By & summarizing values

SELECT   p.FirstName
        ,p.LastName
        ,pa.EndDate
        ,pr.PurchaseDate
        ,pr.SerialNumber
        ,pr.CatalogPrice
        ,v.PlateNumber
        ,v.FirstCirculationDate
        ,v.FirstDrivingTax
        ,v.UsualDrivingTax
FROM     bm_ProductAllocations AS pa
INNER JOIN bm_Persons AS p ON pa.Id_Person = p.Id_Person
INNER JOIN bm_Products AS pr ON pa.Id_Product = pr.Id_Product
INNER JOIN bm_Vehicles AS v ON pr.Id_Product = v.Id_Product
GROUP BY pa.Id_Product
        ,p.FirstName
        ,p.LastName
        ,pa.EndDate
        ,pr.PurchaseDate
        ,pr.SerialNumber
        ,pr.CatalogPrice
        ,v.PlateNumber
        ,v.FirstCirculationDate
        ,v.FirstDrivingTax
        ,v.UsualDrivingTax;