Disable ONLY_FULL_GROUP_BY

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f you want to disable permanently error "Expression #N of SELECT list is not in GROUP BY clause and contains nonaggregated column 'db.table.COL' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by" do those steps:

  1. sudo nano /etc/mysql/my.cnf
  2. Add this to the end of the file

    [mysqld]  
    sql_mode = "STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
  3. sudo service mysql restart to restart MySQL

This will disable ONLY_FULL_GROUP_BY for ALL users

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