postgresql - postgres function returns unexpected set -


i have simple function returns geometry given zip code:

create function public._zip_geom(in zip varchar) returns setof geometry $$     select "the_geom_4326" "shapes"."zip_polys" a."zip" = zip $$ language sql;

that call select public._zip_geom('80302');.

when return defined setof geometry, all geometries in zip_polys table. when change geometry, single geometry, not geometry matches provided zip code.

why , how write function return correct value?

your function argument collides column name (duh!), try:

create function public._zip_geom(in _omg varchar) returns setof geometry $$     select "the_geom_4326" "shapes"."zip_polys" a."zip" = _omg $$ language sql;

the prefix underscore in _doh or _zip more or less convention arguments; column names cannot start underscore, _omg collision free.


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