comparehash
A bitwise XOR of two big Integers. Returns the difference in percent.
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/*
MYSQL QUERY
*/
SELECT ((64 - bit_count(hash1 ^ hash2))*100.0/64);
/*
MYSQL Function
*/
DELIMITER $$
DROP FUNCTION IF EXISTS comparehash $$
CREATE FUNCTION comparehash (hash1 bigint, hash2 bigint)
RETURNS float
DETERMINISTIC
BEGIN
RETURN ((64 - bit_count(hash1 ^ hash2))*100.0/64);
END $$
DELIMITER ;
X
Url: http://www.medienservice-ladewig.de/MYSQL-Hamming-Distance.2099932101.html
Language: SQL | User: Jörg | Created: Oct 21, 2013 | Tags: mysql bitwise xor function