Question

I have a one to many relationship in my database where one event could have multiple dates. I need to find all those events which don’t have any events greater than the current dates (i.e. events which have expired).

I am using the following to select all those events with dates in the future:

SELECT events.id AS id,events.picture,events.name,events.venue,events.city
FROM events,event_dates
WHERE event_dates.start_date >= DATE(NOW())
GROUP BY events.id ORDER BY events.id DESC

I’m not being very smart trying to reverse this, and get events where ALL dates are < DATE(NOW()) or NOT event_dates.start_date >= DATE(NOW())

Which (or neither) is closer to the idea.

Answer 1

Use:

SELECT e.id,
       e.picture,
       e.name,
       e.venue,
       e.city
  FROM EVENTS e
 WHERE NOT EXISTS(SELECT NULL
                    FROM EVENT_DATES ed
                   WHERE ed.event_id = e.id
                     AND ed.start_date >= CURRENT_DATE())