haversine formula with postgreSQL

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От Jonathan
Тема haversine formula with postgreSQL
Дата
Msg-id bfb71d4a-1ff7-4114-a531-24e0fea7e60d@r36g2000vbn.googlegroups.com
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Ответы Re: haversine formula with postgreSQL  (Scott Marlowe <scott.marlowe@gmail.com>)
Re: haversine formula with postgreSQL  (Tom Lane <tgl@sss.pgh.pa.us>)
Re: haversine formula with postgreSQL  (Greg Smith <gsmith@gregsmith.com>)
Список pgsql-general
Hi!

I am looking at the PHP/MySQL Google Maps API store locator example
here:

http://code.google.com/apis/maps/articles/phpsqlsearch.html

And I'm trying to get this to work with PostgreSQL instead of MySQL.

I've (slightly) modified the haversine formula part of my PHP script
but I keep getting this error:

Invalid query: ERROR: column "distance" does not exist LINE
1: ...ude ) ) ) ) AS distance FROM aaafacilities HAVING distance <...
^

I'm new to this, but it doesn't look like I need to create a column in
my table for distance, or at least the directions didn't say to create
a distance column.

Here is my PHP with SQL:
$query = sprintf("SELECT 'ID', 'FACILITY', 'ADDRESS', latitude,
longitude, ( 3959 * acos( cos( radians('%s') ) * cos( radians
( latitude ) ) * cos( radians( longitude ) - radians('%s') ) + sin
( radians('%s') ) * sin( radians( latitude ) ) ) ) AS distance FROM
aaafacilities HAVING distance < '%s' ORDER BY dist LIMIT 0 OFFSET 20",
  pg_escape_string($center_lat),
  pg_escape_string($center_lng),
  pg_escape_string($center_lat),
  pg_escape_string($radius));

Does anyone have any ideas on how I can get this to work?  I'm not
sure what is wrong, since it doesn't seem like I need to create a
distance column and when I do create one, I get this:

Invalid query: ERROR: column "aaafacilities.latitude" must appear in
the GROUP BY clause or be used in an aggregate function

Thanks for any comments or suggestions.  I appreciate it.  I'm new to
this.

Jonathan Harahush

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