/etc/mysql/mysql.conf.d/
vi mysqld.cnf
[mysqld] 
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"
/etc/init.d/mysql restart
Vlastimil Pošmura, 2018