Question

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中运行它时，它会完美地执行并提供正确的输出（一列显示购买最多的vehicleMake，另一列显示购买该vehicleMake的每个人的customerFullName）。

当我在NOVA（Oracle）中运行它时，它只是说“没有选择行”两者之间的语法是否存在差异？我需要更改我的代码吗？谢谢！

Answer 1

回答自己。我在SQL Fiddle和NOVA之间的插入语句中略微不一致地提取数据。这个问题是我的错，从我现在所说的，一切都在按预期进行。

我在SQL小提琴中的插入语句重新使用了一些vehicleVIN数字，这有助于我编写的查询的成功，但是查询对于我想要完成的事情是不正确的。打开另一个问题来讨论这个具体问题。

结论：我不认为它们在NOVA DB语法和SQL Fiddle语法之间存在任何重大差异。一切都很好！

SQL小提琴和Oracle NOVA之间的区别

1 个答案: