Get 30 minutes interval data between start and end time in mysql

Question

I have table structure in mysql,

table_id  no_people  booking_date  bookingend_time      bookingstart_time
      14          2  2014-10-31    2014-10-31 13:30:00  2014-10-31 11:00:00
       5          4  2014-10-31    2014-10-31 16:30:00  2014-10-31 14:30:00
       6          2  2014-10-31    2014-10-31 17:00:00  2014-10-31 16:00:00
       2          4  2014-11-06    2014-11-06 12:30:00  2014-11-06 10:00:00
       2          4  2014-10-31    2014-10-31 16:00:00  2014-10-31 14:00:00
       3          4  2014-11-01    2014-11-01 09:00:00  2014-11-01 07:30:00
       6          2  2014-11-01    2014-11-01 10:00:00  2014-11-01 07:30:00
       2          4  2014-11-03    2014-11-03 10:30:00  2014-11-03 08:30:00
       5          4  2014-11-04    2014-11-04 10:30:00  2014-11-04 08:30:00
       3          4  2014-11-05    2014-11-05 09:30:00  2014-11-05 07:30:00
      14          2  2014-11-05    2014-11-05 09:30:00  2014-11-05 07:30:00

I want to retrieve table_id data with 30 minutes of interval between start and end time.

Ex: if i give booking start time 10:30 and end time 12:30 i should get 14 as row.. Similarly it should check all rows and return between two times ..

My query so far

SELECT `table_id` FROM `booking` WHERE bookingstart_time>='2014-10-31 10:30:00' AND bookingend_time<='2014-10-31 11:30:00'

Answer 1

Step 1: expand the input time frame by 30 minutes before and 30 minutes after. DATE_ADD() and DATE_SUB() can do that:

DATE_SUB(_input_start_date_here_, INTERVAL 30 MINUTE)

Step 2: rethink your problem in terms of start and end times. Here are the possible cases:

• if the booking started during the (expanded) period, then you want this booking in your result
• or if the booking started before the period, then you want this booking unless it also ended before the period
• on the other hand, if the booking started after the period, then you do not want this booking

The first situation above could be expressed like this:

WHERE bookingstart_time >= DATE_SUB(_input_start_date_here_, INTERVAL 30 MINUTE)
AND bookingstart_time <= DATE_ADD(_input_end_date_here_, INTERVAL 30 MINUTE)

The second condition is left as an exercise. You can also rewrite the above with a more elegant BETWEEN operator.

Answer 2

SELECT restaurant_table FROM rest_restaurantbooking WHERE TIMESTAMPDIFF(SECOND, bookingstart_time, bookingend_time) > 1800.

FOR REFERENCE: HERE