错误在SQL集团通过

Question

我工作的家庭作业，这是一个问题：

• 创建从出货量，ShipItems和品牌表返回行的视图名为ShipItemsBrands。

• 该视图应该从货物表中返回这些列：ShipmentID，ShipmentOrderDate，TaxAmount和ShipDate。

• 此视图应从ShipItems表中返回这些列：ShipItemPrice，ShipItemDiscountAmount，FinalPrice（从项目价格减去折扣金额），Quantity和ItemTotal（项目的计算总数）。

• 此视图应返回品牌表中的BrandName列。

这里是我的代码：

CREATE VIEW ShipItemsBrand 
AS 
    SELECT 
     sh.ShipmentID, sh.ShipmentOrderDate, sh.TaxAmount, sh.ShipDate, 
     si.ShipItemPrice, si.ShipItemDiscountAmount, 
     SUM(si.ShipItemPrice - si.ShipItemDiscountAmount) As FinalPrice, 
     si.Quantity, 
     SUM((si.ShipItemPrice - si.ShipItemDiscountAmount) * si.Quantity) AS ItemTotal, 
     b.BrandName 
    FROM 
     Brands AS b 
    JOIN 
     ShipItems AS si ON b.BrandID = si.BrandID 
    JOIN 
     Shipments AS sh ON si.ShipmentID = sh.ShipmentID 
    GROUP BY 
     sh.ShipmentID 

我收到错误代码：

，因为它不包含在列“Shipments.ShipmentOrderDate”在选择列表中无效集合函数或GROUP BY子句。

是否需要将sh.ShipOrderDate添加到GROUP BY？如果是这样，为什么呢？

Answer 1

错误代码：因为它不是在聚合 函数或GROUP BY子句中包含列“Shipments.ShipmentOrderDate”是 选择列表中无效。

我是否需要将sh.ShipOrderDate添加到GROUP BY？如果是这样，为什么是 呢？

排序答案是：是

这是您的SELECT子句（格式化）。这些列已被分成两个部分1.“非聚合”列和2。的“聚集”列，其是thse使用聚合功能等SUM/COUNT/MIN/MAX/AVG等

SELECT 
    -- "non-aggregating columns" 
    sh.ShipmentID, sh.ShipmentOrderDate, sh.TaxAmount 
, sh.ShipDate, si.ShipItemPrice, si.ShipItemDiscountAmount 
, si.Quantity, b.BrandName 
-- "aggregating columns" 
, SUM(si.ShipItemPrice - si.ShipItemDiscountAmount) As FinalPrice 
, SUM((si.ShipItemPrice - si.ShipItemDiscountAmount) * si.Quantity) AS ItemTotal 

立即重新读取错误消息：because it is not contained in either an aggregate function or the GROUP BY clause.这意味着：

1. 从SELECT子句中删除“非聚集”列或
2. 添加“非聚集”列到GROUP BY子句

最终你会发现，所有“不正聚集”列必须在GROUP上市BY子句，像这样：

CREATE VIEW ShipItemsBrand AS 
SELECT 
     -- "non-aggregating columns" 
     sh.ShipmentID, sh.ShipmentOrderDate, sh.TaxAmount 
    , sh.ShipDate, si.ShipItemPrice, si.ShipItemDiscountAmount 
    , si.Quantity, b.BrandName 
    -- "aggregating columns" 
    , SUM(si.ShipItemPrice - si.ShipItemDiscountAmount) As FinalPrice 
    , SUM((si.ShipItemPrice - si.ShipItemDiscountAmount) * si.Quantity) AS ItemTotal 
FROM Brands AS b 
    JOIN ShipItems AS si ON b.BrandID = si.BrandID 
    JOIN Shipments AS sh ON si.ShipmentID = sh.ShipmentID 
GROUP BY 
     -- "non-aggregating columns" 
     sh.ShipmentID, sh.ShipmentOrderDate, sh.TaxAmount 
    , sh.ShipDate, si.ShipItemPrice, si.ShipItemDiscountAmount 
    , si.Quantity, b.BrandName 

---

提示：整理SELECT子句输入到2个部分，然后复制/粘贴下组非聚集列通过。 nb：在粘贴之后删除任何列别名。

注意：在旧版本的MySQL中，可以在group by子句中列出较少的非聚合列。但是这是MySQL特有的，它不被SQL标准支持。另外最近的MySQL版本已经改变了默认行为，并且它也变得更符合标准。

Answer 2

您必须在组中按条款包含'Shipments.ShipmentOrderDate'。 有必要在Group By子句中包含非操作列。

CREATE VIEW ShipItemsBrand AS 
SELECT sh.ShipmentID, sh.ShipmentOrderDate, sh.TaxAmount, sh.ShipDate, 
si.ShipItemPrice, si.ShipItemDiscountAmount, SUM(si.ShipItemPrice - si.ShipItemDiscountAmount) As FinalPrice, si.Quantity, SUM((si.ShipItemPrice - si.ShipItemDiscountAmount) * si.Quantity) AS ItemTotal, 
b.BrandName 
FROM Brands AS b 
    JOIN ShipItems AS si 
     ON b.BrandID = si.BrandID 
    JOIN Shipments AS sh 
     ON si.ShipmentID = sh.ShipmentID 
GROUP BY sh.ShipmentID,sh.ShipmentOrderDate 

Answer 3

CREATE VIEW ShipItemsBrand AS 
SELECT sh.ShipmentID,sh.TaxAmount, sh.ShipDate, 
si.ShipItemPrice, si.ShipItemDiscountAmount, SUM(si.ShipItemPrice - 
si.ShipItemDiscountAmount) As FinalPrice, si.Quantity, SUM((si.ShipItemPrice 
- si.ShipItemDiscountAmount) * si.Quantity) AS ItemTotal, 
b.BrandName 
FROM Brands AS b 
JOIN ShipItems AS si 
    ON b.BrandID = si.BrandID 
JOIN Shipments AS sh 
    ON si.ShipmentID = sh.ShipmentID 
GROUP BY sh.ShipmentID 

CREATE VIEW NewShipItemsBrand AS 
SELECT * from ShipItemsBrand left join Shipments on si.ShipmentID = 
sh.ShipmentID and sh.ShipmentOrderDate=si.ShipmentID