确保只显示不同的产品 ID

Question

考虑从此查询生成的以下部分结果集（源自在 ssms 中创建视图）。

SELECT DISTINCT TOP (100) PERCENT 
    dbo.LandingHeaders.VesselId, dbo.LandingDetails.ProductId, 
    SUM(dbo.LandingDetails.Quantity) AS Quantity, 
    dbo.LandingDetails.UnitPrice
FROM
    dbo.LandingDetails 
INNER JOIN
    dbo.LandingHeaders ON dbo.LandingDetails.LandingId = dbo.LandingHeaders.LandingId 
INNER JOIN
    dbo.Vessels ON dbo.LandingHeaders.VesselId = dbo.Vessels.VesselId
GROUP BY 
    dbo.LandingHeaders.VesselId, dbo.LandingDetails.UnitPrice, 
    dbo.LandingDetails.ProductId, dbo.LandingHeaders.LandingDate1
HAVING        
   (dbo.LandingHeaders.LandingDate1 BETWEEN CONVERT(DATETIME, '2016-01-06 00:00:00', 102) 
                                    AND CONVERT(DATETIME, '2016-01-13 00:00:00', 102))
ORDER BY 
    dbo.LandingHeaders.VesselId, dbo.LandingDetails.ProductId

我只想 return 获取不同的 ProductId 及其相关数量的总和。

编辑

例如，在那些容器 ID 为 4 的条目中，有三行 ProductId 为 22。理想情况下，我希望 return 以下单行，

4    22    19.1   0.4

到目前为止，我得到的最接近的如下。

SELECT DISTINCT 
    ld.ProductId, 
    ROUND(SUM(ld.Quantity), 2) AS Quantity,
    ld.UnitPrice, lh.VesselId 
FROM 
    LandingDetails ld 
JOIN 
    LandingHeaders lh ON ld.LandingId = lh.LandingId
GROUP BY 
    ld.ProductId, ld.UnitPrice, lh.VesselId
WHERE 
    lh.LandingDate1 BETWEEN '20160106' AND '20160113'

这显然还不够接近。欢迎提出建议。

Answer 1

您不需要 DISTINCT，GROUP BY 应该为您完成这项工作。

并且WHERE在GROUP BY

之前

SELECT  DISTINCT ld.ProductId, 
        ROUND(SUM(ld.Quantity),2) AS Quantity,
        ld.UnitPrice, 
        lh.VesselId 
FROM LandingDetails ld 
JOIN LandingHeaders lh 
  ON ld.LandingId = lh.LandingId
WHERE lh.LandingDate1 BETWEEN '20160106' AND '20160113'
GROUP BY ld.ProductId, ld.UnitPrice, lh.VesselId

确保只显示不同的产品 ID

Ensuring Only Distinct Product Id's are shown

sql

sql-server-2014-express