Running Total/cumulative sum & Rolling Average in SQL - Scenario based interview question.

Welcome to Smart Queries Lab! In this video, we dive deep into SQL to master two essential concepts: Running Total and Rolling Average. Whether you're a beginner or an experienced data professional, this step-by-step tutorial will help you understand how to calculate cumulative totals and moving averages using SQL window functions.

What You'll Learn:

How to create a running total that accumulates values over time.
How to calculate a 3-day rolling (moving) average to analyze trends.
Practical examples and real-world use cases to enhance your SQL skills.
Best practices for using SQL window functions to simplify complex calculations.
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Sample data SQL Script :
CREATE TABLE #DailySales (
OrderDate DATE,
TransactionAmount DECIMAL(10,2)
);

-- Insert 20 days of sample data
INSERT INTO #DailySales (OrderDate, TransactionAmount) VALUES
('2023-01-01', 100.00),
('2023-01-02', 200.00),
('2023-01-03', 150.00),
('2023-01-04', 300.00),
('2023-01-05', 250.00),
('2023-01-06', 400.00),
('2023-01-07', 350.00),
('2023-01-08', 500.00),
('2023-01-09', 450.00),
('2023-01-10', 600.00),
('2023-01-11', 550.00),
('2023-01-12', 650.00),
('2023-01-13', 700.00),
('2023-01-14', 800.00),
('2023-01-15', 750.00),
('2023-01-16', 900.00),
('2023-01-17', 850.00),
('2023-01-18', 950.00),
('2023-01-19', 1000.00),
('2023-01-20', 1100.00);

Видео Running Total/cumulative sum & Rolling Average in SQL - Scenario based interview question. канала Smart Queries Lab