Overview
Window functions are a powerful feature in SQL that allow you to perform calculations across a set of rows related to the current row. Unlike regular aggregate functions, window functions do not group rows into a single output. Instead, they provide a way to analyze data while retaining the individual row details. This makes them useful for tasks like running totals, moving averages, and ranking data within partitions.
📚 Key Learning Objectives
- ✓ Identify the purpose of window functions in SQL.
- ✓ Differentiate between window functions and aggregate functions.
- ✓ Write basic SQL queries using window functions.
- ✓ Calculate running totals and moving averages with window functions.
- ✓ Rank data within partitions using window functions.
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