Find overlapping (date/time) rows within one table

Question

I have a table which stores in each row a meeting with start date/time and end date/time.

meetingID int
meetingStart datetime
meetingEnd datetime

De

Answer 1

Try using this query. It is Quassnoi's solution modified to ignore cases where the end of one booking is the same as the start of another.

SELECT  m1.meetingID_id, m1.meetingStart , m1.meetingEnd, m2.meetingID_id
FROM    bookings m1, bookings m2
WHERE   (m2.meetingStart BETWEEN m1.start AND DATE_SUB(m1.meetingEnd, INTERVAL 1 second)
        OR DATE_SUB(m2.meetingEnd, INTERVAL 1 second) BETWEEN m1.meetingStart AND m1.end)
        AND m1.meetingID_id > m2.meetingID_id