Order table by proximity to specific latitude/longitude (using MySQL+PHP)
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01-10-2019 - |
Question
MySQL (table)
id | url | lat | lng
----------------------------------
1 | x | 44.339565 | -101.337891
----------------------------------
2 | y | 44.150681 | -101.074219
----------------------------------
3 | z | 43.897892 | -100.634766
what I want to do now is order the list according to their proximity to (43.834527,-99.140625).
$a = mysql_query("SELECT * FROM table ORDER BY proximity DESC");
while($b = mysql_fetch_assoc($a))
{
echo $b['url'].'<br />';
}
Solution
You may be interested in checking out the following presentation:
The author describes how you can use the Haversine Formula in MySQL to order by proximity and limit your searches to a defined range. He also describes how to avoid a full table scan for such queries, using traditional indexes on the latitude and longitude columns.
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