Customize MySQL configuration

Example of disable the ONLY_FULL_GROUP_BY restriction:

  • Check the current sql_mode setting in mysql: SELECT @@GLOBAL.sql_mode and copy the result.
  • Stop mysql service: $ sudo /etc/init.d/mysql stop or $ sudo systemctl stop mysql
  • List the configuration files: $ mysql --help | grep 'my.cnf'

  • To disable ONLY FULL GROUP BY in MySQL 5.7

    Added this line in the bottom of /etc/mysql/mysql.conf.d/mysqld.cnf

    sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'
    

For MySQL 8.0

  • Create custom *.cnf file under /etc/mysql/conf.d/ directory:

    $ sudo vim /etc/mysql/conf.d/disable_full_group_by.cnf
    
    • Content of disable_full_group_by.cnf

      [mysqld]
      # Note: Origin sql_mode = 'ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'
      sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'
      

Reboot mysql service to see if the modification works

  • Reboot mysql service: $ sudo /etc/init.d/mysql start or $ sudo systemctl start mysql
  • Login mysql and check the result: SELECT @@GLOBAL.sql_mode
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