SQL Window Functions Explained | Running Total, ROWS vs RANGE (HCL Interview Question)

Описание: In this video, I explain SQL Window Aggregate Functions in a clear, interview-oriented way, focusing on SUM() OVER() and running total logic.

We start directly in the SQL editor, understand how window functions work, and then dive into one of the most confusing interview topics:

✔ Running Total
✔ Grand Total
✔ ROWS vs RANGE
✔ UNBOUNDED PRECEDING
✔ CURRENT ROW
✔ FOLLOWING
✔ Handling duplicate values
✔ Running total starting from 2nd row

Many candidates memorize syntax but fail in interviews because they don’t understand how SQL thinks internally.
This video explains the logic behind window frames, not just the syntax.

🔥 Important:
This exact ROWS vs RANGE running total problem was asked in an HCL SQL interview, and most candidates failed.

If you are preparing for:

SQL Interviews

Data Analyst / BI roles

Advanced SQL concepts

Window functions with real-world logic

👉 This video is for you.

⏱ Topics Covered:

SQL Window Aggregate Functions

SUM() OVER explained

Running Total in SQL

ROWS vs RANGE difference

UNBOUNDED PRECEDING explained

CURRENT ROW explained

FOLLOWING explained

Running total from 2nd row

Interview traps & tips

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