ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregate

When mysql 5.7 first uses group by, an error occurs. First, the table information is as follows:
ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column ‘test.score.id’ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

select c_name,id from score group by c_name;

Check out the check mode of MySQL5.7

Remove the ONLY_FULL_GROUP_BY item by modifying the my.cnf or my.ini configuration file (created if there is no such configuration item)
add the following line to the file

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

Then restart mysql
will not appear ONLY_FULL_GROUP_BY at this time

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