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PostGIS

Introduction
Quiz
11. Question 10
Congratulations

Instruction

That's it! And now, the final question!

Exercise

For each hotel chain (i.e. hotels with the same name) in the Downtown, display its name and calculate the total length (in meters) of all fences that would be standing 5 meters from the walls of each hotel in a given chain. Show the results by the total length in descending order. Use SRID 26910.