Laravel Eloquent - distinct() and count() not working properly together

Question

So I\'m trying to get the number of distinct pids on a query, but the returned value is wrong.

This is what I try to do:

$ad->getcodes()->group         


        

Answer 1

Anyone else come across this post, and not finding the other suggestions to work?

Depending on the specific query, a different approach may be needed. In my case, I needed either count the results of a GROUP BY, e.g.

SELECT COUNT(*) FROM (SELECT * FROM a GROUP BY b)

or use COUNT(DISTINCT b):

SELECT COUNT(DISTINCT b) FROM a

After some puzzling around, I realised there was no built-in Laravel function for either of these. So the simplest solution was to use use DB::raw with the count method.

$count = $builder->count(DB::raw('DISTINCT b'));

Remember, don't use groupBy before calling count. You can apply groupBy later, if you need it for getting rows.