cartodb - how to detect polygons within other (many) polygons in postgis -


i have 2 datasets: 1. zipcodes , 2. neighborhoods (think of them counties).

i want join each neighborhood zipcodes cover it. neighborhoods within 1 zipcode, in cases neighborhoods straddle two. example:

neighborhood 1 inside 20001
neighborhood 2 inside 20002
neighborhood 3 inside 20001,20002

here have far:

select name, zipcode       neighborhood_names nn, dc_zipcode_boundries dzb st_intersects(nn.the_geom, dzb.the_geom);

note: updated within based on comments, getting answer each neighborhood still not able array function respond expected.

i figured out. john. statement needed group (whcih error said, needed time digest before clicked).

the snippet below worked following

select name, array_to_string(array_agg(zipcode), ',')      neighborhood_names nn, dc_zipcode_boundries dzb st_intersects(nn.the_geom, dzb.the_geom) group name

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