SQL实现工作日计算
CREATE FUNCTION Time_Span_of_minutes(start_day DATETIME,end_day DATETIME)RETURNS FLOATBEGIN-- 返回按分钟计算两段时间的间隔，采用逐日靠近的方法求解，一天按8小时480分钟计算，周末不计，不考虑法定节假日。-- 如果起始日期在周末，则计算当天时间。DECLARE minutes FLOAT;DECLARE next_day DATETIME;SET minutes=0.0;SET next_day=start_day;IF(TIMESTAMPDIFF(DAY,start_day,end_day)<1.0) THENSET minutes=minutes+TIMESTAMPDIFF(MINUTE,start_day,end_day);ELSEWHILE TIMESTAMPDIFF(DAY,next_day,end_day)>=1.0 DOIF ((DAYOFWEEK(next_day)=7) OR (DAYOFWEEK(next_day)=1)) THENSET next_day=next_day+INTERVAL 1 DAY;ELSESET next_day=next_day+INTERVAL 1 DAY;SET minutes=minutes+480.0;END IF;END WHILE;SET minutes=minutes+TIMESTAMPDIFF(MINUTE,next_day,end_day);IF ((DAYOFWEEK(start_day)=7) OR (DAYOFWEEK(start_day)=1)) THENSET minutes=minutes+TIMESTAMPDIFF(MINUTE,start_day,CONVERT(CONCAT(SUBSTRING(start_day FROM 1 FOR 10),' 17:30:00'),DATETIME));END IF;END IF;RETURN minutes;END;
