invalid：聚合函數或GROUP BY子句

Question

嗨，我似乎無法弄清楚我在做什么錯。 我對SQL還是很陌生，所以我無法解決這個問題。 任何幫助將是巨大的！

SELECT PC.Name AS [ProductCategoryName]   
,      MIN(PCH.StandardCost) AS MinStandardCost
,      AVG(PCH.StandardCost) AS AverageStandardCost
,      MAX(PCH.StandardCost) AS MaxStandardCost 
FROM    ProductCategory PC
INNER JOIN    Product P ON (PC.ProductCategoryID = P.ProductCategoryID)
INNER JOIN    ProductCostHistory PCH ON ( P.ProductID = PCH.ProductID)
WHERE PC.Name LIKE '%Bike%'

Answer 1

您忘記了group by子句：

SELECT PC.Name AS [ProductCategoryName]   
,      MIN(PCH.StandardCost) AS MinStandardCost
,      AVG(PCH.StandardCost) AS AverageStandardCost
,      MAX(PCH.StandardCost) AS MaxStandardCost 
FROM    ProductCategory PC
INNER JOIN    Product P ON (PC.ProductCategoryID = P.ProductCategoryID)
INNER JOIN    ProductCostHistory PCH ON ( P.ProductID = PCH.ProductID)
WHERE PC.Name LIKE '%Bike%'
group by PC.NAME