#sql

Описание: Window Functions are one of the most powerful features in SQL!
They allow you to perform calculations across rows without losing individual row details.

In this video, you'll learn:
✔ What are Window Functions?
✔ Why are they different from GROUP BY?
✔ How to use OVER(), PARTITION BY, ORDER BY
✔ Ranking & analytical functions
✔ Real-time use cases for Data Analysts

🚀 Topics Covered:

🔹 Aggregate Window Functions
SUM(), AVG(), COUNT() over partitions

🔹 Ranking Functions

ROW_NUMBER()

RANK()

DENSE_RANK()

🔹 Value Functions

LEAD() (Next row value)

LAG() (Previous row value)

🔹 Window Frame Clause
ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW

🧠 Use Cases in Real Projects

• Top 3 products by sales in each region
• Employee salary ranking by department
• Month-over-month comparison using LEAD/LAG
• Running total and moving average

Perfect for:
✨ Data Analysts • SQL Beginners • Data Engineers • Students preparing for Interviews

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