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+--- Thread: Using join (/showthread.php?tid=13074)
Using join - El Forum - 11-10-2008
[eluser]Marcelo Kanzaki[/eluser]
Hello everybody,
here is the situation:
I have 3 tables in my database - Events, Consultants and Locations.
To generate an event, i need pick one (or more) consultant from the Consultants table along with a location from the Locations table.
To handle the one_to_many relationship between Events and Consultants i've created a fourth table called Consultants_Events, wich has the event_id and the consultant_id that allows me to add more than one consultant per event.
Quote:***** My question is how do i list Events now? *****
I could simply use
Code:
$this->db->get('events');
$this->db->join('locations', 'locations.id = events.location_id');But what about the consultants? Since there can be more than one per event, how do i list them?
Using join - El Forum - 11-10-2008
[eluser]Xeoncross[/eluser]
I haven't tried it - but just use several joins.
Code:
$this->db->join('consultants', 'consultants.id = consultants_events.consultant_id');
$this->db->join('events', 'events.id = consultants_events.event_id');
$this->db->join('locations', 'locations.id = events.location_id');
//Fetch
$this->db->get('consultants_events');Using join - El Forum - 11-10-2008
[eluser]crumpet[/eluser]
when I do this i use two seperate queries - one for events and one for consultants...
inefficient but i dont know a better way to handle it.