Join tables and display city.name - php

Question

Having issues joining two tables and displaying the other value, tables are setup and models are loaded and starts with a capital letter.
What i want is to match jobs.city_id and cities.id and display cities.city_name
Jobs_model.php
public function get_city(){
$this->db->select('*');
$this->db->from('cities');
$this->db->join('jobs', 'cities.city_name = jobs.city_id');
$this->db->where('jobs.city_id = cities.id');
$query = $this->db->get();
}
Controller.php
$data['city_name'] = $this->jobs_model->get_city();
View.php
<?php echo $city_name['city_name'];?>
SQL
CITIES
id
city_name
JOBS
id
city_id
update. sql and typo

Answer 1

You also have not returned any thing in model function
If you need a specific type of JOIN you can specify it via the third parameter of the function. Options are: left, right, outer, inner, left outer, and right outer.
This function example below only will return one row at a time you may need to use result_array(); read this link below how to generate results https://www.codeigniter.com/user_guide/database/results.html
public function get_city(){
$this->db->select('*');
$this->db->from('cities');
$this->db->join('jobs', 'jobs.city_id = cities.id', 'LEFT');
//$this->db->where('jobs.city_id = cities.id');
$query = $this->db->get();
// Note only returns one row
return $query->row_array();
}
And On Controller
$info = $this->jobs_model->get_city();
$data['city_name'] = $info['city_name'];
Multiple Results
public function get_city(){
$this->db->select('*');
$this->db->from('cities');
$this->db->join('jobs', 'jobs.city_id = cities.id', 'LEFT');
$query = $this->db->get();
return $query->result_array();
}
And on controller
$data['cities'] = $this->jobs_model->get_city();
View
<?php foreach ($cities as $city) {?>
<?php echo $city['city_name'];?>
<?php }?>

Answer 2

I am giving you a simple SQL for reference -
select cities.name from cities, jobs where jobs.city_id = cities.id

Answer 3

Change your Model to
public function get_city(){
$this->db->select('*');
$this->db->from('cities');
$this->db->join('jobs', 'cities.city_id= jobs.city_id');
$this->db->where('jobs.city_id = cities.id');
$query = $this->db->get();
return $query->result_array()
}

Answer 4

You are comparing wrong field in join query
public function get_city(){
$this->db->select('*');
$this->db->from('cities');
$this->db->join('jobs', 'cities.id = jobs.city_id'); //<---id instead of city_name
//$this->db->where('jobs.city_id = cities.id'); // remove where
$query = $this->db->get();
}

Answer 5

Use this
$this->db->join('jobs', 'cities.city_id = jobs.city_id');
instead of this
$this->db->join('jobs', 'cities.city_name = jobs.city_id');

Answer 6

Should be like this:
join('jobs', 'cities.id = jobs.city_id');
I think that's the issue.