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PostgreSQL function to calculate the distance between to points in a spherical surface.
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| CREATE OR REPLACE FUNCTION haversine(latitude1 numeric(10,6),longitude1 numeric(10,6), latitude2 numeric(10,6), longitude2 numeric(10,6)) | |
| RETURNS double precision AS | |
| $BODY$ | |
| SELECT 3959 * acos( cos( radians(latitude1) ) * cos( radians( latitude2 ) ) * cos( radians( longitude1 ) - radians(longitude2) ) + sin( radians(latitude1) ) * sin( radians( latitude2 ) ) ) AS distance | |
| $BODY$ | |
| LANGUAGE sql; | |
| /* | |
| SELECT id, | |
| name, | |
| latitude__c, | |
| longitude__c, | |
| haversine(40.5378408, -7.2662964, a.latitude__c::numeric, a.longitude__c::numeric) AS distance | |
| FROM | |
| public.example AS ex WHERE (longitude__c IS NOT NULL AND latitude__c IS NOT NULL) ORDER BY distance ASC; | |
| */ |
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