Hi,

once a Postgis layer X is retrieved, how can I juggle with subsets of X?

eg. I am working with bubble plots on a EU dataset but I want to do test it
only using a 30x30Km in the nearby of Rome and I have no attribute data but
the value I use for the bubbles. Should I use "subset"? Can I set a kinda
of custom bbox?

regards
-r

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