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Window Functions in MS SQL Server

Introduction
Quick Refresher
PARTITION BY ORDER BY with Ranking
PARTITION BY ORDER BY with Window Frames
Using PARTITION BY ORDER BY with Analytical Functions
Summary and Review
23. Exercise 3

Instruction

Impressive! And finally, the last question.

Exercise

For each phone, show the Phone, the Day, the number of paid repairs on that day, the number of paid repairs on the previous day and the difference between these two values. Name the last columns LastPaidRepairs and Difference.