Aggregating (x,y) coordinate point clouds in PostgreSQL

Question

I have a a PostgreSQL database table with the following simplified structure:

• Device Id varchar
• Pos_X (int)
• Pos_Y (int)

Basica

Answer 1

select [some aggregates] group by (pos_x/5, pos_y/5); 

Where instead of 5 you can have any number depending how much aggregation you need/