#sql
Автор: Data Ideas
Загружено: 2025-11-26
Просмотров: 292
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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