Laravel Postgres Formatted Date Month Year Error Ordering Dates - php

Question

I have a database that looks like this :
I want to make a graph of total costs across a specified period based on different statuses. My query is returning month/year and the total cost at that time.
Despite using order by to display data in an ascending order, my graph is quite unordered. This is how my query looks :
$delivery_failure = DB::table('partners_sms')->select(DB::raw('month, sum(sum) as y'))
->whereBetween('created_at', [new Carbon($start_date), new Carbon($end_date)])
->where('failure_reason', '=', 'DeliveryFailure')
->groupBy('month')
->orderBy('month', 'DESC')
->get();
I have also tried this approach with no luck:
$successNonPartner = SMSData::query()->selectRaw("to_char(created_at::timestamp, 'MONTH-YYYY') as month")
->whereBetween('created_at', [new Carbon($start_date), new Carbon($end_date)])
->where('status', '=', 'Success')
->groupBy('created_at')
->orderBy('created_at', 'DESC')
->get();
Any advise or recommendations on an ideal approach to format my date in month/year and order the dates will be appreciated. I am using laravel and postgres.

Answer 1

to_char(created_at,'YYYY-MONTH') will be of help but it returns a string, probably why order_by doesn't work. You can try returning dates, order by will work and then convert the date to a format of choice in the graph
$successNonPartner = SMSData::selectRaw("month, CEIL(sum(sum)) as y")
->whereBetween('created_at', [new Carbon($start_date), new Carbon($end_date)])
->where('status', '=', 'Success')
->groupBy('month')
->orderBy('month', 'DESC')
->get();