mysql 检查房间是否存在于具有持续时间的特定日期

Question

I have check room is exists between two time for particular date.

I have try following two query its run some time rights but, when i select 10:00 AM to 12:00 PM at time wrong results means not return any records.

QUERY-1 :

SELECT 1 FROM `timetable_details` WHERE (
        ((`td_from` <= '10:00:00') AND (`td_to` > '10:00:00')) 
        OR 
        ((`td_from` < '12:20:00') AND (`td_to` >= '12:20:00'))

    ) AND ((`td_room`='1') AND (`td_date`='2016-01-25'))

QUERY-2 :

SELECT 1 FROM `timetable_details` WHERE (
            (`td_from` > '07:00:00') AND (`td_to` < '08:00:00')
      ) AND ((`td_room`='1') AND (`td_date`='2016-01-25'))

I have get td_id = 4 number row but is not returns.

Answer 1

您可以between两列between使用OR condition ，如下所示：

SELECT 1 FROM `timetable_details` WHERE (((((`td_from` BETWEEN '10:00:00' AND '12:30:00') OR (`td_to` BETWEEN '10:00:00' AND '12:30:00')) AND ((`td_room`='1') AND (`td_date`='2016-01-25') AND (`td_status` IS NULL))) AND (`td_from` <> '12:30:00')) AND (`td_to` <> '10:00:00'))