[英]Difference Between SQL Fiddle and Oracle NOVA
我有以下表格:
CREATE TABLE CUSTOMERS
(customerID INT PRIMARY KEY,
customerFullName VARCHAR(20) NOT NULL);
CREATE TABLE VEHICLES
(vehicleVIN VARCHAR(25) PRIMARY KEY,
vehicleMake VARCHAR(15) NOT NULL);
CREATE TABLE SALES
(saleID INT PRIMARY KEY,
customerID INT,
vehicleVIN VARCHAR(25));
CONSTRAINT SALES_FK1 FOREIGN KEY (customerID) REFERENCES CUSTOMERS(customerID),
CONSTRAINT SALES_FK2 FOREIGN KEY (vehicleVIN) REFERENCES VEHICLES(vehicleVIN));
并构建了以下查询以运行这些表:
SELECT VEHICLES.vehicleMake, CUSTOMERS.customerFullName
FROM SALES
JOIN CUSTOMERS on SALES.customerID = CUSTOMERS.customerID
JOIN(
SELECT SALES.vehicleVIN, VEHICLES.vehicleMake
FROM SALES
JOIN VEHICLES ON SALES.vehicleVIN = VEHICLES.vehicleVIN
GROUP BY SALES.vehicleVIN, VEHICLES.vehicleMake
HAVING COUNT(SALES.vehicleVIN) >= ALL
(SELECT COUNT(SALES.vehicleVIN)
FROM SALES
INNER JOIN VEHICLES ON SALES.vehicleVIN=VEHICLES.vehicleVIN
GROUP BY VEHICLES.vehicleMake))
VEHICLES ON SALES.vehicleVIN = VEHICLES.vehicleVIN
ORDER BY CUSTOMERS.customerFullName;
当我在SQL Fiddle中运行此代码时,它会完美执行并提供正确的输出(一列显示购买量最多的vehicleMake,另一列显示购买该载具的每个人的customerFullName)。
当我在NOVA(Oracle)中运行它时,它只是说“未选择行”两者在语法上有区别吗? 我需要更改代码吗? 谢谢!
回答自己。 我在SQL Fiddle和NOVA之间的插入语句中拉出数据时,存在微小差异。 问题是我的错,从我现在可以看出,一切都在按预期进行。
我在SQL小提琴中的insert语句正在重新使用一些vehicleVIN编号,这有助于我编写的查询成功,但是该查询对于我要完成的工作是不正确的。 提出了另一个问题来讨论该特定问题。
底线:我不认为它们是NOVA DB语法和SQL Fiddle语法之间的主要区别。 一切都很好!
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