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September 2017 Update

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Ingy döt Net 2017-09-23 10:01:46 +02:00
parent bba7bfd280
commit ba8067c3b7
14570 changed files with 153136 additions and 63871 deletions
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Task/Haversine-formula/MySQL/haversine-formula.sql Normal file
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DELIMITER $$
CREATE FUNCTION haversine (
lat1 FLOAT, lon1 FLOAT,
lat2 FLOAT, lon2 FLOAT
) RETURNS FLOAT
NO SQL DETERMINISTIC
BEGIN
DECLARE r FLOAT unsigned DEFAULT 6372.8;
DECLARE dLat FLOAT unsigned;
DECLARE dLon FLOAT unsigned;
DECLARE a FLOAT unsigned;
DECLARE c FLOAT unsigned;
SET dLat = RADIANS(lat2 - lat1);
SET dLon = RADIANS(lon2 - lon1);
SET lat1 = RADIANS(lat1);
SET lat2 = RADIANS(lat2);
SET a = POW(SIN(dLat / 2), 2) + COS(lat1) * COS(lat2) * POW(SIN(dLon / 2), 2);
SET c = 2 * ASIN(SQRT(a));
RETURN (r * c);
END$$
DELIMITER ;