Disable ONLY_FULL_GROUP_BY

Solution 1: Remove ONLY_FULL_GROUP_BY from mysql console

SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

Solution 2: Remove ONLY_FULL_GROUP_BY from phpmyadmin

1. Open phpmyadmin & select localhost
2. Click on menu Variables & scroll down for sql mode
3. Click on edit button to change the values & remove ONLY_FULL_GROUP_BY & click on save

Solusi 3: (Permanent) mengikuti pada point.2 lalu melakukan editing pada file my.cnf

[mysqld] 
# ... other stuff will probably be here 
sql_mode = "STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"