How to get single last record with a particular id in codeigniter

Question

Here i have 2 tables. First one is customer and second on is membership

Now i just want to get a single last record with a particular <

Answer 1

To get last record for each customer from membership table based on highest id you can do a self join to membership by tweaking the joining part like

$this->db->select('c.*,m.*');
$this->db->from('customer as c');
$this->db->join('membership as m', 'c.id = m.customer_id', 'left'); 
$this->db->join('membership as m1', 'm.customer_id = m1.customer_id AND m.id < m1.id', 'left'); 
$this->db->where('m1.id IS NULL', null, false)
$query = $this->db->get(); 

A plain SQL would be something like

SELECT c.*,m.*
FROM customer AS c 
LEFT JOIN membership AS m ON c.id = m.customer_id 
LEFT JOIN membership AS m1 ON m.customer_id = m1.customer_id 
               AND m.id < m1.id
WHERE m1.id IS NULL