Matching data from 2 table with validation date

@DELE,

users_campaigns_join could be a view or a query (subset of data).  I just used the name to represent the data.

Like below...

PHP Code:

select ucj.id
from users_campaigns_join_view ucj
inner join incomes i on i.id = ucj.id
where i.date = '2018-10-10' 


I do not really understand your point.

this is the code that I use to produce (what you call) ucj.

PHP Code:

public function test1()
{
    $this->db->select();
    $this->db->from('users');
    $this->db->join('campaigns', 'campaigns.id = users.id');
    $res = $this->db->get();

    foreach ($res->result() as $key) {
       echo $key->ID.'<br>';
    }
}

// Results
// 00001
// 00005
// 00008 


how to implement your method using this method?

PHP Code:

public function test2()
{
    $this->db->select();
    $this->db->from('???'); // how to implement your method here?
    $this->db->join('incomes', 'incomes.id = ???.id');
    $this->db->where(???);

    $res = $this->db->get();
    foreach ($res->result() as $key) {
       echo $key->ID.'<br>';
    }
}

// So the results can be like this
// 005
// 008