在SQL中，如何根据另一列中的字符串值对一列中的数值求和

Question

我希望我的程序按PlantName返回AcceptedProducts的PlantName 。

有人可以帮我纠正我的程序吗？

CREATE PROCEDURE spAcceptedByCountry @Year INT, @Month INT
AS
    SELECT      CountryCode,
                CountryName,
                REPLACE(SUBSTRING([PlantName], CHARINDEX('-', [PlantName]), LEN([PlantName])), '-', '') AS [PlantName],
                SUM(AcceptedProducts) AS AcceptedProducts 
    FROM        vAcceptedByCountry
    WHERE       YEAR(DateOfManufacture) = @Year AND MONTH(DateOfManufacture) = @Month
    GROUP BY    CountryCode,
                CountryName,
                PlantName,
                AcceptedProducts
    ORDER BY    CountryCode;
GO

感谢您的帮助。 亲切的问候。

Answer 1

尝试这个：

CREATE PROCEDURE spAcceptedByCountry @Year INT, @Month INT
AS
    SELECT      CountryCode,
                CountryName,
                REPLACE(SUBSTRING([PlantName], CHARINDEX('-', [PlantName]), LEN([PlantName])), '-', '') AS [PlantName],
                SUM(AcceptedProducts) AS AcceptedProducts 
    FROM        vAcceptedByCountry
    WHERE       YEAR(DateOfManufacture) = @Year AND MONTH(DateOfManufacture) = @Month
    GROUP BY   1, 2, 3
    ORDER BY    CountryCode;
GO

您不想按您尝试计算的聚合进行分组。

因此，现在您正在计算每个国家/地区代码/国家/地区名称/植物名称的可接受产品，其中植物名称不是列，而是选择子句中的项目。