Return data ordered by date - php

Question

I have a function that returns the count of sales each day. The problem with this approach is that I want the data to be stored by date but I am getting them in the following order:
01-Dec
02-Dec
03-Dec
03-Nov
04-Nov
05-Nov
etc.
I understand why that happens but I am not sure how to solve it. I can replace subMonth(1) with startofmonth which woul partially solve my problem but this is not what I want. I instead want to return the last 30 days ordered.
return DB::table('sales')
->select(\DB::RAW('DATE_FORMAT(created_at, "%d-%M") as date'), \DB::raw('COUNT(*) as count'))
->where('created_at', '>=', Carbon::now()->subMonth(1))
->orderBy('date')
->groupBy('date')
->get(['date', 'count'])
->keyBy('date')
->transform(function ($data) {
return $data->count;
});
I also tried orderBy('created_at') but it gives me the error below and I'd like to avoid changing the sql mode.
Syntax error or access violation: 1055 Expression #3 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'x.sales.created_at' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
EDIT:
As requested, this the sql query of the return statement
select DATE_FORMAT(created_at, "%d-%M") as date, COUNT(*) as count from `sales` where `created_at` >= ? group by `date` order by `date` asc

Answer 1

i don't have much idea about your framework query syntax. but you can take one more column DATE_FORMAT(created_at, "%Y%m%d") AS order_column and apply order, and group by on column "order_column" and use column "data" while display data.
select DATE_FORMAT(created_at, "%Y%m%d") AS order_column, DATE_FORMAT(created_at, "%d-%M") as date, COUNT(*) as count from `sales` where `created_at` >= ? group by `order_column` order by `order_column` asc
return DB::table('sales')
->select(\DB::RAW('DATE_FORMAT(created_at, "%Y%m%d") AS order_column'),\DB::RAW('DATE_FORMAT(created_at, "%d-%M") as date'), \DB::raw('COUNT(*) as count'))
->where('created_at', '>=', Carbon::now()->subMonth(1))
->orderBy('order_column')
->groupBy('order_column')
->get(['date', 'count'])
->keyBy('date')
->transform(function ($data) {
return $data->count;
});

Answer 2

If you make this in 2 steps does it work?
Step1 in which you create date column:
$step1 = DB::table('sales') ->select(\DB::RAW('DATE_FORMAT(created_at, "%d-%M") as date')))
->where('created_at', '>=', Carbon::now()->subMonth(1))
->orderBy('date')
->get(['date', 'count'])
and after that you make the agregation:
$step2 = $step1->select('date'), \DB::raw('COUNT(date) as count'))
->groupBy('date') ->get(['date', 'count']) ->keyBy('date')
Hope it helps!