Hello 2011/5/16 Bernardo Telles <btelles@xxxxxxxxx>: > Wow, you guys are some fast-acting dudes (and yes, I am an adult, but a kid > at heart). > > David, yup, that's exactly the part of the documentation that I read, and > that is confusing me, because when I try it at home, it's not working. In > fact, the exact example that I'm showing in the first email uses that > assumption, but it seems to not be working :-/ What PostgreSQL version do you have? It's not supported on older versions regards Pavel Stehule > > But I'll take another look at the query tonight and see if I'm missing > something. > > On Mon, May 16, 2011 at 1:55 PM, David Johnston <polobo@xxxxxxxxx> wrote: >> >> Please read section â39.6.1. Returning From a Functionâ in the pl/pgsql >> section of the documentation (actually, you should read the entire section >> on pl/pgsql programming). >> >> >> >> âRETURN QUERY appends the results of executing a query to the function's >> result set.â [when used with RETURNING SETOF *] >> >> >> >> Concatenate and âappendâ are synonyms in this context; otherwise the above >> quote from section 39.6.1 is basically a word-for-word answer to your >> question. >> >> >> >> David J. >> >> >> >> From: pgsql-general-owner@xxxxxxxxxxxxxx >> [mailto:pgsql-general-owner@xxxxxxxxxxxxxx] On Behalf Of Bernardo Telles >> Sent: Monday, May 16, 2011 1:13 PM >> To: pgsql-general@xxxxxxxxxxxxxx >> Subject: Re: How do we combine and return results from multiple >> queries in a loop? >> >> >> >> Hi John, >> Thanks for the quick response. I'll elaborate on the actual problem. >> Basically, I want to call: >> >> select * from partiesWithin("DAYTONA", "FL", 5); >> >> The partiesWithin() function finds all zip codes (and zip_code centroids), >> then searches a 5 (or n) mile radius around those centroids for parties. >> Since each zip code has a 'point' column which is a PostGIS feature, I need >> to iterate through each of those points, and search for parties within 5 >> miles of each of the centroids, returning a concatenated query of all >> parties that were found in any of the queries. Someone mentioned that one >> way to do that is to use a temporary table inside the partiesWithin >> function. Any thoughts? >> >> On Mon, May 16, 2011 at 1:28 AM, John R Pierce <pierce@xxxxxxxxxxxx> >> wrote: >> >> On 05/15/11 8:53 PM, Bernardo Telles wrote: >> >> Hi there, >> We'd like to use a plpgsql function to use results from query A to execute >> several queries B, C, etc., and return the results of all B, C, etc queries >> as one result set. Would placing 'RETURN QUERY' inside a loop automatically >> concatenate all 'return query' results in the function's return? If not, how >> would we go about getting this result? >> >> >> >> all the queries would have to have the same fields to do this. Âif they >> do, then you can write it as a join or union. >> >> in your example case, its easy. >> >> Â Âselect * from locations l join zipcode z on l.state = z.state where >> z.zipcode like '32301%'; >> >> this also would be more efficient than the way you proposed >> >> now, if you're thinking of a DIFFERENT problem thats more complex to >> solve, well, without knowing the actual problem there's not much I can >> suggest. >> >> >> >> -- >> Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) >> To make changes to your subscription: >> http://www.postgresql.org/mailpref/pgsql-general >> >> > -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
