HP SQL INTERVIEW QUESTION | Customer Reference
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DROP TABLE IF EXISTS Customers;
DROP TABLE IF EXISTS Invoice;
-- Creating Customers table
CREATE TABLE Customers (
Id INT PRIMARY KEY,
Name VARCHAR(100) NOT NULL,
referredBy INT
);
-- Creating Invoice table
CREATE TABLE Invoice (
Id INT PRIMARY KEY,
BillingDate DATE NOT NULL,
CustomerID INT
);
-- Inserting data into Customers table
INSERT INTO Customers (Id, Name, referredBy)
VALUES
(1, 'John Doe', NULL), -- No referral
(2, 'Jane Smith', 1), -- Referred by John Doe
(3, 'Alice Johnson', 1), -- Referred by John Doe
(4, 'Bob Brown', 2), -- Referred by Jane Smith
(5, 'Charlie Davis', 3); -- Referred by Alice Johnson
-- Inserting data into Invoice table
INSERT INTO Invoice (Id, BillingDate, CustomerID)
VALUES
(1, '2024-09-01', 1), -- Invoice for John Doe
(2, '2024-09-03', 2), -- Invoice for Jane Smith
(3, '2024-09-05', 3), -- Invoice for Alice Johnson
(4, '2024-09-10', 4), -- Invoice for Bob Brown
(5, '2024-09-12', 5); -- Invoice for Charlie Davis
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