Group by not working - Laravel
Edit your applications's database config file config/database.php
In mysql array, set strict => false to disable MySQL's strict mode
Maybe your issue is due to the fact that you are using a MySQL server vith version 5.7.5+. From this version on the way GROUP BY works is changed since they make it behave in order to be SQL99 compliant (where in previous versions it was not).
Try to do a full group by or change the configuration of your MySQL server.
Link to official MySQL doc where full GROUP BY is explanined
Go to config/database.php
Update strict value false.
return [ 'connections' => [ 'mysql' => [ 'strict' => false ] ]]