Tiger Analytics Interview Question | Cumulative Sum Without Window Functions | Self-Join Explained

In this video, learn how to calculate a cumulative sum in SQL using a self-join , an essential concept for SQL interview preparation. We’ll break down the logic step-by-step, explaining how the join condition. ensures that for each row, only the current and preceding rows contribute to the cumulative total.

This method avoids using advanced window functions and showcases SQL's versatility in solving real-world problems. Perfect for preparing for SQL job interviews or improving your SQL skills for database management.

📌 Key Topics Covered:

What is a self-join in SQL?
How cumulative sum works without the OVER clause.
Practical examples to build your SQL expertise.

✅ Who Should Watch:

Aspiring SQL developers.
Data professionals preparing for interviews.
Anyone looking to deepen their SQL knowledge.

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--------------------------Table Script---------------------------------------------------

create table new_sale(
Date date,
salary int
)

insert into new_sale values('2024-01-01', 100),
('2024-01-02',800),
('2024-01-03',1100),
('2024-01-04',1200),
('2024-01-05',1300),
('2024-01-06',1400),
('2024-01-07',1500),
('2024-01-08',1600),
('2024-01-09',1700),
('2024-01-10',1800)