Hi, I have two tables: establishment which contains these columns: id, name, longitude, latitude, geom (Geometric column) Product contains: id, name, establishment_id First of all I want to select the establishment within a radius. I run this query: select e.name, e1.name from establishment as e, establishment as e1 where e.id <> e1.id and e1.id = 1 and ST_DWithin(geom, ST_MakePoint(e1.longitude, e1.latitude)::geography, 1000)
The result of this query returns all the establishment within a radius 1KM from from a given establishment which has an id = 1. After that I want to get the product's name of each establishment from the query's result. Is there an other optimized solution to make a query such this: select * from ( select e.name, e1.name, e.id from establishment as e, establishment as e1 where e.id <> e1.id and e1.id = 1 and ST_DWithin(geom, ST_MakePoint(e1.longitude, e1.latitude)::geography, 1000)) as tmp inner join product as p on p.establishment_id = tmp.id
