Laravel selectSub with IFNULL - mysql

Question

I have a complex query with a correlated subquery which I would like to integrate in my Laravel application.
The problem is that the subquery is inside IFNULL.
The query is very big, I tried to write a very reduced one only for demonstration:
SELECT payment_status_id, client_tbl.client_id
IFNULL((SELECT payment_status_id
FROM payment_status_tbl
WHERE payment_status_tbl.client_id = client_tbl.client_id
ORDER BY status_date DESC
LIMIT 1), 0) AS current_status_id
FROM client_tbl
HAVING current_status_id < 4;
I reached this query in Laravel:
$query = DB::table('client_tbl')
->select(['payment_status_id', 'client_tbl.client_id'])
->selectSub(function($query) {
$query->select('payment_status_id')
->from('payment_status_tbl')
->where('payment_status_tbl.client_id', '=', 'client_tbl.client_id')
->orderByDesc('status_date')
->limit(1);
}, 'current_status_id')
->having('current_status_id', '<', 4);
but it does not include the IFNULL statement, which is important in my original query.
Any idea whether it is possible?

Answer 1

Try this
$query = DB::table('client_tbl')
->select(['payment_status_id', 'client_tbl.client_id'])
->selectSub(function($query) {
$getId = DB::table('payment_status_tbl')
->where('payment_status_tbl.client_id','`client_tbl.client_id`')
->select('payment_status_id')
->orderBy('status_date','DESC')
->first();
$query->empty($getId)? 0 : $getId->payment_status_id;
}, 'current_status_id')
->having('current_status_id', '<', 4);