MySQL选择IF INNER JOIN

Question

I have 3 tables:

place (placeId,placeName,...)
event (eventId, eventName,...)
picture (pictureId,associateId,picturePath,type [1 place 2 event])

This is what I want:

When picture type is 1 picture.associateId=place.placeId return path

when picture type is 2 picture.associateId=event.eventId return path

1 place -> many events

1 place -> one picture

1 event -> one picture

May be something like this (please help):

SELECT Place.placeName, Picture.picturePath, Event.eventId, ... FROM Place INNER JOIN Event ON Place.placeId = Event.eventPlace INNER JOIN Picture ON (IF Picture.type=1 return Picture.picturePath ELSE Picture.type=2 return Picture.picturePath)

This consult return me a json to show events on a page deppending of the date:

SELECT Place.placeName, Place.placePopularity, Picture.picturePath, Event.eventId, Event.eventCount
FROM Place INNER JOIN Picture ON Place.placeId = Picture.associateId 
    INNER JOIN Event ON Place.placeId = Event.eventPlace
WHERE Picture.type = 2 AND Event.eventDate = '$date'
ORDER BY Event.eventCount DESC

Answer 1

Run an if else with this

    if () { // picture type 1
        // this is the query
        $query = "SELECT pictureTable.picture_path FROM placeTable INNER JOIN picture_table ON placeTable.placeId = picture_table.associateId";
        } else { // picture type 2 means for event

        $query = "SELECT pictureTable.picture_path FROM eventTable INNER JOIN  picture_table ON eventTable.eventId = picture_table.associateId";
       // now you can get the result
       }

Hope this helps.