Using the Northwind Dataset, What query would generate the total orders under each employee? [closed] - mysql

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The expected answer
would yield the following:
name
employee ID
subordinates
totalOrders
Dr. Andrew Fuller
2
1, 3, 5, 7, 6, 9, 8, 4
830
Mr. Steven Buchanan
5
7, 6, 9
224
Mrs. Margaret Peacock
4
156
Ms. Janet Leverling
3
127
Ms. Nancy Davolio
1
123
Ms. Laura Callahan
8
104
Mr. Robert King
7
72
Mr. Michael Suyama
6
67
Ms. Anne Dodsworth
9
43
Question Clarifications
The tally of the orders "under each employee" includes the orders fulfilled by the given employee, the orders for those that report to that employee, the order for those that report to those employees, etc, etc.
Notes:
The query to generate the number of orders for each employee is somewhat straight-forward
SELECT
CONCAT(TitleOfCourtesy, ' ', FirstName, ' ', LastName) AS name,
COUNT(Orders.OrderID) AS orders
FROM northwind.orders AS Orders
LEFT JOIN northwind.employees AS Employees
ON Orders.EmployeeID = Employees.EmployeeID
GROUP BY name
ORDER BY orders DESC
which gives
name
orders
Mrs. Margaret Peacock
156
Ms. Janet Leverling
127
Ms. Nancy Davolio
123
Ms. Laura Callahan
104
Dr. Andrew Fuller
96
Mr. Robert King
72
Mr. Michael Suyama
67
Ms. Anne Dodsworth
43
Mr. Steven Buchanan
42
But I don't know the right way to get from here to the final answer. I'd be grateful for any help you're able to provide.
Appendix:
For convenience I've hosted the Northwind dataset accessible with a MySQL client (ie. MySQL Workbench) at:
Hostname: northwind.techiteasy.ca
port: 3310
Username: mariadb
Password: password
However in order to keep the question self-contained, here some relevant snippets from the Northwind dataset:
-- ------------------------------------------
-- Table structure for `Employees`
-- ------------------------------------------
CREATE TABLE `Employees` (
`EmployeeID` INTEGER NOT NULL AUTO_INCREMENT,
`LastName` VARCHAR(20) NOT NULL,
`FirstName` VARCHAR(10) NOT NULL,
`Title` VARCHAR(30),
`TitleOfCourtesy` VARCHAR(25),
`BirthDate` DATETIME,
`HireDate` DATETIME,
`Address` VARCHAR(60),
`City` VARCHAR(15),
`Region` VARCHAR(15),
`PostalCode` VARCHAR(10),
`Country` VARCHAR(15),
`HomePhone` VARCHAR(24),
`Extension` VARCHAR(4),
`Photo` LONGBLOB,
`Notes` MEDIUMTEXT NOT NULL,
`ReportsTo` INTEGER,
`PhotoPath` VARCHAR(255),
`Salary` FLOAT,
CONSTRAINT `PK_Employees` PRIMARY KEY (`EmployeeID`)
);
CREATE INDEX `LastName` ON `Employees` (`LastName`);
CREATE INDEX `PostalCode` ON `Employees` (`PostalCode`);
-- ------------------------------------------
-- Records of Employees
-- ------------------------------------------
INSERT INTO Employees VALUES
(1, 'Davolio', 'Nancy', 'Sales Representative', 'Ms.', '1948-12-08 00:00:00', '1992-05-01 00:00:00', '507 - 20th Ave. E.\r\nApt. 2A', 'Seattle', 'WA', '98122', 'USA', '[phone]', '5467', NULL, 'Education includes a BA in psychology from Colorado State University in 1970. She also completed \"The Art of the Cold Call.\" Nancy is a member of Toastmasters International.', 2, 'http://accweb/emmployees/davolio.bmp', 2954.55),
(2, 'Fuller', 'Andrew', 'Vice President, Sales', 'Dr.', '1952-02-19 00:00:00', '1992-08-14 00:00:00', '908 W. Capital Way', 'Tacoma', 'WA', '98401', 'USA', '[phone]', '3457', NULL, 'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of Dallas in 1981. He is fluent in French and Italian and reads German. He joined the company as a sales representative, was promoted to sales manager in January 1992 and to vice president of sales in March 1993. Andrew is a member of the Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.', NULL, 'http://accweb/emmployees/fuller.bmp', 2254.49),
(3, 'Leverling', 'Janet', 'Sales Representative', 'Ms.', '1963-08-30 00:00:00', '1992-04-01 00:00:00', '722 Moss Bay Blvd.', 'Kirkland', 'WA', '98033', 'USA', '[phone]', '3355', NULL, 'Janet has a BS degree in chemistry from Boston College (1984). She has also completed a certificate program in food retailing management. Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.', 2, 'http://accweb/emmployees/leverling.bmp', 3119.15),
(4, 'Peacock', 'Margaret', 'Sales Representative', 'Mrs.', '1937-09-19 00:00:00', '1993-05-03 00:00:00', '4110 Old Redmond Rd.', 'Redmond', 'WA', '98052', 'USA', '[phone]', '5176', NULL, 'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American Institute of Culinary Arts (1966). She was assigned to the London office temporarily from July through November 1992.', 2, 'http://accweb/emmployees/peacock.bmp', 1861.08),
(5, 'Buchanan', 'Steven', 'Sales Manager', 'Mr.', '1955-03-04 00:00:00', '1993-10-17 00:00:00', '14 Garrett Hill', 'London', null, 'SW1 8JR', 'UK', '(71) 555-4848', '3453', NULL, 'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976. Upon joining the company as a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent post in London. He was promoted to sales manager in March 1993. Mr. Buchanan has completed the courses \"Successful Telemarketing\" and \"International Sales Management.\" He is fluent in French.', 2, 'http://accweb/emmployees/buchanan.bmp', 1744.21),
(6, 'Suyama', 'Michael', 'Sales Representative', 'Mr.', '1963-07-02 00:00:00', '1993-10-17 00:00:00', 'Coventry House\r\nMiner Rd.', 'London', null, 'EC2 7JR', 'UK', '(71) 555-7773', '428', NULL, 'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles (MBA, marketing, 1986). He has also taken the courses \"Multi-Cultural Selling\" and \"Time Management for the Sales Professional.\" He is fluent in Japanese and can read and write French, Portuguese, and Spanish.', 5, 'http://accweb/emmployees/davolio.bmp', 2004.07),
(7, 'King', 'Robert', 'Sales Representative', 'Mr.', '1960-05-29 00:00:00', '1994-01-02 00:00:00', 'Edgeham Hollow\r\nWinchester Way', 'London', null, 'RG1 9SP', 'UK', '(71) 555-5598', '465', NULL, 'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the University of Michigan in 1992, the year he joined the company. After completing a course entitled \"Selling in Europe,\" he was transferred to the London office in March 1993.', 5, 'http://accweb/emmployees/davolio.bmp', 1991.55),
(8, 'Callahan', 'Laura', 'Inside Sales Coordinator', 'Ms.', '1958-01-09 00:00:00', '1994-03-05 00:00:00', '4726 - 11th Ave. N.E.', 'Seattle', 'WA', '98105', 'USA', '[phone]', '2344', NULL, 'Laura received a BA in psychology from the University of Washington. She has also completed a course in business French. She reads and writes French.', 2, 'http://accweb/emmployees/davolio.bmp', 2100.50),
(9, 'Dodsworth', 'Anne', 'Sales Representative', 'Ms.', '1966-01-27 00:00:00', '1994-11-15 00:00:00', '7 Houndstooth Rd.', 'London', null, 'WG2 7LT', 'UK', '(71) 555-4444', '452', NULL, 'Anne has a BA degree in English from St. Lawrence College. She is fluent in French and German.', 5, 'http://accweb/emmployees/davolio.bmp', 2333.33);
-- ------------------------------------------
-- Table structure for `Orders`
-- ------------------------------------------
CREATE TABLE `Orders` (
`OrderID` INTEGER NOT NULL AUTO_INCREMENT,
`CustomerID` VARCHAR(5),
`EmployeeID` INTEGER,
`OrderDate` DATETIME,
`RequiredDate` DATETIME,
`ShippedDate` DATETIME,
`ShipVia` INTEGER,
`Freight` DECIMAL(10,4) DEFAULT 0,
`ShipName` VARCHAR(40),
`ShipAddress` VARCHAR(60),
`ShipCity` VARCHAR(15),
`ShipRegion` VARCHAR(15),
`ShipPostalCode` VARCHAR(10),
`ShipCountry` VARCHAR(15),
CONSTRAINT `PK_Orders` PRIMARY KEY (`OrderID`)
);
CREATE INDEX `OrderDate` ON `Orders` (`OrderDate`);
CREATE INDEX `ShippedDate` ON `Orders` (`ShippedDate`);
CREATE INDEX `ShipPostalCode` ON `Orders` (`ShipPostalCode`);
-- ------------------------------------------
-- Records of `Orders`
-- ------------------------------------------
INSERT INTO `Orders` VALUES
(10248, 'VINET', 5, '1996-07-04', '1996-08-01', '1996-07-16', 3, 32.38, 'Vins et alcools Chevalier', '59 rue de l''Abbaye', 'Reims', NULL, '51100', 'France'),
(10249, 'TOMSP', 6, '1996-07-05', '1996-08-16', '1996-07-10', 1, 11.61, 'Toms Spezialitäten', 'Luisenstr. 48', 'Münster', NULL, '44087', 'Germany'),
(10250, 'HANAR', 4, '1996-07-08', '1996-08-05', '1996-07-12', 2, 65.83, 'Hanari Carnes', 'Rua do Paço, 67', 'Rio de Janeiro', 'RJ', '05454-876', 'Brazil'),
(10251, 'VICTE', 3, '1996-07-08', '1996-08-05', '1996-07-15', 1, 41.34, 'Victuailles en stock', '2, rue du Commerce', 'Lyon', NULL, '69004', 'France'),
...
(11072, 'ERNSH', 4, '1998-05-05', '1998-06-02', NULL, 2, 258.64, 'Ernst Handel', 'Kirchgasse 6', 'Graz', NULL, '8010', 'Austria'),
(11073, 'PERIC', 2, '1998-05-05', '1998-06-02', NULL, 2, 24.95, 'Pericles Comidas clásicas', 'Calle Dr. Jorge Cash 321', 'México D.F.', NULL, '05033', 'Mexico'),
(11074, 'SIMOB', 7, '1998-05-06', '1998-06-03', NULL, 2, 18.44, 'Simons bistro', 'Vinbæltet 34', 'Kobenhavn', NULL, '1734', 'Denmark'),
(11075, 'RICSU', 8, '1998-05-06', '1998-06-03', NULL, 2, 6.19, 'Richter Supermarkt', 'Starenweg 5', 'Genève', NULL, '1204', 'Switzerland'),
(11076, 'BONAP', 4, '1998-05-06', '1998-06-03', NULL, 2, 38.28, 'Bon app''', '12, rue des Bouchers', 'Marseille', NULL, '13008', 'France'),
(11077, 'RATTC', 1, '1998-05-06', '1998-06-03', NULL, 2, 8.53, 'Rattlesnake Canyon Grocery', '2817 Milton Dr.', 'Albuquerque', 'NM', '87110', 'USA');