带联接的SQL Select查询：如何在没有外键的情况下对非主属性的特定次数进行计数

Question

使用下表：

CREATE TABLE CUSTOMERS
(customerID     INT     PRIMARY KEY,
customerFullName        VARCHAR(20) NOT NULL,
customerStreet      VARCHAR(40) NOT NULL,
customerState       VARCHAR(15) NOT NULL,
customerCity        VARCHAR(20) NOT NULL,
customerZip     VARCHAR(15) NOT NULL);

CREATE TABLE VEHICLES
(vehicleVIN     VARCHAR(25) PRIMARY KEY,
vehicleType     VARCHAR(10) NOT NULL CHECK (lower(vehicleType) IN ('compact', 'midsize', 'fullsize', 'suv', 'truck')),
vehicleMake     VARCHAR(15) NOT NULL,
vehicleModel        VARCHAR(15) NOT NULL,
vehicleWhereFrom    VARCHAR(20) NOT NULL CHECK (lower(vehicleWhereFrom) IN ('maryland','virginia','washington, d.c.')),
vehicleWholesaleCost    DECIMAL(9,2)    NOT NULL,
vehicleTradeID      INT);

CREATE TABLE SALES
(saleID         INT     PRIMARY KEY,
grossSalePrice      DECIMAL(9,2),
vehicleStatus       VARCHAR(10) NOT NULL CHECK (lower(vehicleStatus) IN ('available', 'sold', 'pending')),
saleDate        DATE,
saleMileage     INT,
customerID      INT,
salespersonID       INT,
vehicleVIN      VARCHAR(25),
CONSTRAINT SALES_FK1 FOREIGN KEY (customerID) REFERENCES CUSTOMERS(customerID),
CONSTRAINT SALES_FK2 FOREIGN KEY (vehicleVIN) REFERENCES VEHICLES(vehicleVIN));

我建立了以下查询，以显示涉及最多销售额的vehicleMake和购买该品牌车辆的所有人的customerFullName：

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Oracle NOVA DB中运行此程序时，结果仅是“未选择行”。 我怀疑这是因为以下子句是在计算出售车辆VIN的次数，而不是在计算出售VehicleMake的次数。

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;

我将如何更改此SELECT Count子查询来计算vehicleMake出现的次数而不是vehicleVIN出现的次数？ 我正在寻找的输出是：

vehicleMake     customerFullName
CAR2            Bob Jim
CAR2            Jim Bob
CAR2            Steve France
CAR2            Tom Williams
CAR2            John Johnson

它应该只显示销售量最大的vehicleMake中的vehicleMake，以及购买该品牌任何车辆的人的customerFullName。 如果要查看我已构建的架构，请参见以下SQL Fiddle的链接： http : //sqlfiddle.com/#!4/b0ac3a

Answer 1

http://sqlfiddle.com/#!4/b0ac3a/67

WITH
  tallied_sales AS
(
  SELECT
    SALES.*,
    VEHICLES.vehicleMake,
    COUNT(*) OVER (PARTITION BY VEHICLES.vehicleMake)   AS vehicleMakeSales
  FROM
    SALES
  INNER JOIN
    VEHICLES
      ON VEHICLES.vehicleVIN  = SALES.vehicleVIN
),
  ranked_sales AS
(
  SELECT
    tallied_sales.*,
    RANK() OVER (ORDER BY vehicleMakeSales DESC)   AS vehicleMakeSalesRank
  FROM
    tallied_sales
)
SELECT
  *
FROM
  ranked_sales
INNER JOIN
  CUSTOMERS
    ON CUSTOMERS.customerID = ranked_sales.customerID
WHERE
  ranked_sales.vehicleMakeSalesRank = 1
;