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16 lines
435 B
16 lines
435 B
CREATE OR REPLACE FUNCTION `distance`(
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lon1 DOUBLE,
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lat1 DOUBLE,
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lon2 DOUBLE,
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lat2 DOUBLE
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) RETURNS double
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BEGIN
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SET @earth_radius = 6371;
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SET @dLat = deg2rad(lat2-lat1);
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SET @dLon = deg2rad(lon2-lon1);
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SET lat1 = deg2rad(lat1);
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SET lat2 = deg2rad(lat2);
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SET @a = SIN(@dLat/2) * SIN(@dLat/2) + SIN(@dLon/2) * SIN(@dLon/2) * COS(lat1) * COS(lat2);
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SET @c = 2 * ATAN2(SQRT(@a), SQRT(1-@a));
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RETURN @earth_radius * @c;
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END;
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