MySQL - Finding time overlaps

Posted by Jude on Stack Overflow See other posts from Stack Overflow or by Jude
Published on 2010-04-28T07:02:27Z Indexed on 2010/04/28 7:13 UTC
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mysql

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database

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sql

Hi, I have 2 tables in the database with the following attributes:

Booking
=======
booking_id
booking_start
booking_end

resource_booked
===============
booking_id
resource_id

The second table is an associative entity between "Booking" and "Resource" (i.e., 1 booking can contain many resources). Attributes booking_start and booking_end are timestamps with date and time in it.

May I know how I might be able to find out for each resource_id (resource_booked) if the date/time overlaps or clashes with other bookings of similar resource_id?

I was doodling the answer on paper, pictorially, to see if it might help me visualize how I could solve this and I got this:

Joining the 2 tables (Booking, Booked_resource) into one table with the 4 attributes needed.
Follow the answer suggested here : http://stackoverflow.com/questions/689458/find-overlapping-date-time-rows-within-one-table

I did step 1 but step 2 is leaving me baffled!

I would really appreciate any help on this! Thanks!

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