ONLY_FULL_GROUP_BY Issue On Server
If Smart School showing ONLY_FULL_GROUP_BY error message on your server that means on your hosting ONLY_FULL_GROUP_BY is enabled in your mysql SQL_MODE. This issue comes due to on some hosting server mysql is not configured properly. Please contact to your hosting provider to disable/removeONLY_FULL_GROUP_BY in your hosting mysql SQL_MODE or follow the below instruction to fix this issue (it will require full root access of your