Window functions allow you to perform aggregate calculations like SUM and AVG on a set of rows without grouping, by defining a "window" of rows. They use syntax like SUM(duration_seconds) OVER (PARTITION BY start_time) to calculate a sum for each start_time partition. Window functions include row_number(), rank(), and allow ordering and partitioning to define the calculation window.

1. Microsoft Proudly Presents
Window Functions

2. What are window functions?
Aggregate functions without the GROUP BY

3. Syntax
● SUM(duration_seconds)
● OVER (PARTITION BY start_time )

4. Window vs Aggregate

5. row_number()

6. rank()

7. Separate window declaration

8. OVER ()

9. OVER( ORDER BY )

10. OVER( ORDER BY )