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-- Get ready to share your screen, write some code, -- and discuss your answers. -- Start by reviewing the code below. When you are -- ready, click the 'Run SQL code'button to view the tables. -- Begin reading the questions on line 100 and provide -- your answer beneath the corresponding task. DROP TABLE IF EXISTS departments CASCADE; DROP TABLE IF EXISTS employees CASCADE; DROP TABLE IF EXISTS cars CASCADE; DROP TABLE IF EXISTS customers CASCADE; DROP TABLE IF EXISTS sales CASCADE; -- schema CREATE TABLE departments ( id SERIAL NOT NULL, Name VARCHAR(25) NOT NULL, PRIMARY KEY(id) ); CREATE TABLE employees ( id INT NOT NULL, FName VARCHAR(35) NOT NULL, LName VARCHAR(35) NOT NULL, PhoneNumber VARCHAR(11), ManagerId INT, DepartmentId INT NOT NULL, Salary INT NOT NULL, HireDate timestamp NOT NULL, PRIMARY KEY(id), FOREIGN KEY (ManagerId) REFERENCES Employees(id), FOREIGN KEY (DepartmentId) REFERENCES Departments(id) ); CREATE TABLE customers ( id SERIAL NOT NULL, FName VARCHAR(35) NOT NULL, LName VARCHAR(35) NOT NULL, Email varchar(100) NOT NULL, PhoneNumber VARCHAR(11), PreferredContact VARCHAR(5) NOT NULL, PRIMARY KEY(id) ); CREATE TABLE cars ( id SERIAL NOT NULL, Model varchar(50) NOT NULL, Color varchar(50) NOT NULL, TotalCost INT NOT NULL, PRIMARY KEY(id) ); -- data INSERT INTO departments (id, Name) VALUES (1, 'HR'), (2, 'Sales'), (3, 'Tech') ; INSERT INTO employees (id, FName, LName, PhoneNumber, ManagerId, DepartmentId, Salary, HireDate) VALUES (1, 'James', 'Smith', 1234567890, NULL, 1, 1000, '01-01-2002'::timestamp without time zone), (2, 'John', 'Johnson', 2468101214, '1', 1, 400, '03-03-2005'::timestamp without time zone), (3, 'Michael', 'Williams', 1357911131, '1', 2, 600, '12-05-2009'::timestamp without time zone), (4, 'Johnathon', 'Smith', 1212121212, '2', 1, 500, '07-07-2016'::timestamp without time zone), (5, 'William', 'Morris', 5555555555, '1', 2, 800, '08-05-2009'::timestamp without time zone); INSERT INTO customers (id, FName, LName, Email, PhoneNumber, PreferredContact) VALUES (1, 'William', 'Jones', 'william.jones@example.com', '3347927472', 'PHONE'), (2, 'David', 'Miller', 'dmiller@example.net', '2137921892', 'EMAIL'), (3, 'Richard', 'Davis', 'richard0123@example.com', NULL, 'EMAIL'), (4, 'Elon', 'Musk', 'bigrocketguy@twitter.com', NULL, 'EMAIL'), (5, 'John', 'Dutton', 'yellowstoneranch@paramount.com', NULL, 'EMAIL') ; INSERT INTO cars (id, Model, Color, TotalCost) VALUES ('1', 'Ford F-150', 'Black', '230'), ('2', 'Ford F-150', 'Silver', '200'), ('3', 'Ford Mustang', 'Red', '350'), ('4', 'Tesla Model 3', 'Blue', '325'), ('5', 'Ford F-350', 'Brown', '500') ; -- DEPARTMENTS SELECT * FROM departments; -- EMPLOYEES SELECT * FROM employees; -- CUSTOMERS SELECT * FROM customers; -- CARS SELECT * FROM cars; -- TASK 1 GOAL: -- The car dealership owner wants to set commission -- percentages for sales employees. All salesperson should have a commission percentage of: 5% -- -- Write the required SQL Commands to ALTER the above tables and insert/update -- data to support the new requirements. ALTER TABLE employees ALTER COLUMN commissions SET DEFAULT 0; SELECT * FROM employees; -- TASK 2 GOAL: -- A markup percentage is required to be defined per vehicle -- -- Write the SQL command to add a markup percentage per model as follows: -- Ford F series (any size) = 15% Tesla = 25% Ford Mustang = 10% -- -- TASK 3 GOAL: -- Define a new table called Sales that will track all sales of vehicles including: -- What vehicle they bought, who bought it, how much it cost the customer, who sold the car, -- and what their commission for the sale was (in dollars) -- -- The result of this task should be an empty table that is ready to track sales data and an -- example of one insert statement used to populate a row in the table