查询适用于MySQL 5.1但不适用于SQL2000

Question

我正在尝试从Win2000 Server SQL Server 2000 v8.00.760上运行的OLD数据库中提取一些数据，但是我收到了错误消息。我的查询正在我正在使用的当前数据库中工作，但我不知道我正在做什么，如果这是问题，那么它不会向后比较。

这是我的查询：

SELECT o.CustomerID, o.ShipName, o.ShipCity, o.ShipStateOrProvince, o.ShipPostalCode, o.ShipPhoneNumber, c.Profession, SUM( o.Total ) 
FROM Orders o

JOIN Customers c ON o.CustomerID = c.CustomerID

WHERE (o.OrderDate >= '2012-01-01')
AND (o.Void <> - 1)
AND (o.Cancelled <> - 1)

GROUP BY o.CustomerID

在MySQL中它工作正常。我正以我想要的方式回复查询。但我得到错误......

当我在旧版SQL中试用它时。

我现在有点迷失了。谁能告诉我我做错了什么？

谢谢！

Answer 1

SQL Server对GROUP BY比MySQL更严格。 SELECT子句中的所有非聚合列也必须出现在GROUP BY中。例如，当给定CustomerID存在多个ShipName值时，这可以避免可能出现的歧义。虽然MySQL会随意选择一个，但SQL Server会强制您将它们视为单独的行。

SELECT o.CustomerID, o.ShipName, o.ShipCity, o.ShipStateOrProvince, o.ShipPostalCode, o.ShipPhoneNumber, c.Profession, SUM( o.Total ) 
FROM Orders o

JOIN Customers c ON o.CustomerID = c.CustomerID

WHERE (o.OrderDate >= '2012-01-01')
AND (o.Void <> - 1)
AND (o.Cancelled <> - 1)

GROUP BY o.CustomerID, o.ShipName, o.ShipCity, o.ShipStateOrProvince, o.ShipPostalCode, o.ShipPhoneNumber, c.Profession

Answer 2

当存在聚合函数时，SQL服务器要求每个字段都包含在SELECT中以包含在GROUP BY子句中，因此您必须将所有字段添加到GROUP BY ：

SELECT o.CustomerID
    , o.ShipName
    , o.ShipCity
    , o.ShipStateOrProvince
    , o.ShipPostalCode
    , o.ShipPhoneNumber
    , c.Profession
    , SUM( o.Total ) 
FROM Orders o
JOIN Customers c 
    ON o.CustomerID = c.CustomerID
WHERE (o.OrderDate >= '2012-01-01')
    AND (o.Void <> - 1)
    AND (o.Cancelled <> - 1)
GROUP BY o.CustomerID
    , o.ShipName
    , o.ShipCity
    , o.ShipStateOrProvince
    , o.ShipPostalCode
    , o.ShipPhoneNumber
    , c.Profession