SQL Select 带连接的查询：如何在没有外键的情况下计算非主属性的特定出现次数

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));

我构建了以下查询以显示参与最多销售的车辆品牌以及所有购买该品牌车辆的客户的全名：

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;

当我在我的 Oracle NOVA DB 中运行时，我只得到 "no rows selected" 作为结果。我怀疑这是因为以下子句计算的是 vehicleVIN 的销售次数，而不是计算 vehicleMake 的销售次数。

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;

我如何更改此 SELECT Count 子查询以计算 vehicleMake 的出现次数而不是 vehicleVIN 的出现次数？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

它应该只显示销售最多的车辆品牌的车辆品牌，以及购买该品牌任何车辆的人的客户全名。这是 link 到 SQL Fiddle 如果您想查看我构建的架构：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
;

SQL Select 带连接的查询：如何在没有外键的情况下计算非主属性的特定出现次数

SQL Select Query with Join: How to Count a Certain Number of Occurences on non-primary Attribute without a Foreign Key

sql

oracle

join

having-clause

novaclient