Simple Eloquent query taking too long time to execute

Question

I have 2 queries. Even though the first one is more complicated and pulls much more data it takes only 154 ms to execute, meanwhile the second one takes 1.76 s to execute.

First (executing fast):

$offers = Offer::select(\DB::raw('tbl_offer.offer_id as sys_id, 
                                  tbl_offer.offer_name, 
                                  tbl_offer.preview_url, 
                                  COALESCE(tbl_offer.is_allow_website_links, 
                                  false) as is_allow_website_links, 
                                  tbl_offer.is_require_approval, 
                                 tbl_relationship.fk_relationship_status_id, 
                                  tbl_offer.is_private,
                                  tbl_offer.currency'))
                        ->leftJoin('tbl_relationship', function ($q) use ($affiliateId) {

                        $q->on('tbl_offer.offer_id', '=', 'tbl_relationship.fk_offer_id')
                          ->where('tbl_relationship.fk_affiliate_id', '=', $affiliateId);})
                          ->whereIn('fk_offer_status_id', [ 18, 19 ])
                          ->where('is_display', 1)
                          ->where('tbl_offer.is_trd_deleted', 0)
                          ->orderBy('offer_name')
                          ->get();

Second (executing slowly):

$currencies = Currency::select(\DB::raw('DISTINCT currency_code_from AS currency'))
                 ->where('sys_name', 'openexchangerates')
                 ->orderBy('currency')
                 ->get();   

1. What could possibly be the issue?
2. Do you have any ideas on how to decrease loading time?

Answer 1

first of all you are using 2 queries into one.

This is the first query:

$currencies = Currency::where('sys_name', 'openexchangerates')
            ->orderBy('currency')
            ->get();  

And this is another:

\DB::raw('DISTINCT currency_code_from AS currency')

In order to use both queries into one, you should use this:

$currencies = Currency::selectRaw('DISTINCT currency_code_from AS currency')
            ->where('sys_name', 'openexchangerates')
            ->orderBy('currency')
            ->get();   

I hope this way will decrease the executing time.