Question

I’m trying to retrieve rows from a venues table where there are no events placed on that day.

This is how I would retrieve an event:

SELECT
    events.*,
    venues.*,
    party_types.PARTYTYPE
FROM events
INNER JOIN venues 
    ON events.VENUE_LOCATION = venues.ID
WHERE start_datetime >= '$DATE_START_SELECTED'
AND end_datetime < '$DATE_END_SELECTED' 
GROUP BY events.ID

Where $DATE_START_SELECTED and $DATE_END_SELECTED are PHP variables that basically say Take all events between Date1 and Date2.

This is how I currently retrieve venues:

SELECT
venues.*
FROM venues
GROUP BY venues.VENUE_NAME

How would I go about retrieving all venues where there are no events held on that day (dependent on the PHP variables)?

Thanks everyone! 🙂

Answer 1

SELECT
venues.*
FROM venues
LEFT JOIN events ON events.VENUE_LOCATION = venues.ID  AND start_datetime >= '$DATE_START_SELECTED' AND end_datetime < '$DATE_END_SELECTED'
where events.VENUE_LOCATION IS NULL
GROUP BY venues.VENUE_NAME