Count weekdays between two dates in MySql
DELIMITER $$ CREATE DEFINER=`su`@`%` FUNCTION `TOTAL_WEEKDAYS`(date1 DATE, date2 DATE) RETURNS INT(11) RETURN ABS(DATEDIFF(date2, date1)) + 1 - ABS(DATEDIFF(ADDDATE(date2, INTERVAL 1 - DAYOFWEEK(date2) DAY), ADDDATE(date1, INTERVAL 1 - DAYOFWEEK(date1) DAY))) / 7 * 2 - (DAYOFWEEK(IF(date1 < date2, date1, date2)) = 1) - (DAYOFWEEK(IF(date1 > date2, date1, date2)) = 7)$$ DELIMITER ;
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