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Window Functions in PostgreSQL

Introduction
Simple OVER()
PARTITION BY
Ranking functions
Window frame
Analytic functions
ORDER BY PARTITION BY
28. PARTITION BY ORDER BY – Exercise 1
Order of evaluation
Summary

Instruction

Simply perfect. Let's move on.

Exercise

For each review, show the following information: its id, title of the movie, the rating and the previous rating given by any customer to the same movie when sorted by the id of the reviews.

Stuck? Here's a hint!

JOIN tables review and movie. Use OVER(PARTITION BY movie_id ORDER BY review.id).