Murray’s company needed an easy way to tell whether or not a given date was a banking holiday or not. Someone wrote this function for MySQL .

CREATE FUNCTION `IS_HOLIDAY`(a_date datetime) RETURNS char(5) CHARSET utf8 COLLATE utf8_bin
   READS SQL DATA
   DETERMINISTIC
BEGIN

   DECLARE is_holiday char(5);

     select (CASE WHEN (DAYOFWEEK(a_date) = 1 OR DAYOFWEEK(a_date) = 7)

                      THEN 'Yes' ELSE 'No' END) INTO is_holiday;

   RETURN is_holiday;

 END

  Murray apparently works for Ebenezer Scrooge, and should be grateful that he gets weekends off.