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Window Functions in PostgreSQL

Introduction
Final quiz
13. Question 10
Summary

Instruction

Excellent. Ok, let's solve the last problem. Question 10/11.

Exercise

For each procedure, show the following information: procedure_date, name, price, category, score, the price of the best procedure (in terms of the score) from the same category (column best_procedure) and the difference between price and best_procedure (column difference).