ONLY_FULL_GROUP_BY Issue On Server
Sun, 12 Apr, 2020
Open phpMyadmin of your server then go to Variables tab then edit sql mode variable value and remove ONLY_FULL_GROUP_BY.
Note: This fix is temporary and if your mysql server will be restart or update it will comes on default state. So ask your hosting admin to make it permanently in mysql config file.
Generally this issue occurred in cheap or non professional hosting. If you will go with hosting providers like godaddy or hostgator or any reputed hosting provider then you will not face this issue.