使用mysql group by 报错

问题：通过 GROUP BY 查询时抛出下列异常

SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #19 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.s.download_add' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

解决方法：

• 1.在my.cnf中加入sql_model = ""

sudo vim /etc/my.cnf

• 2.重启mysql
  启动MySql服务：
  sudo /usr/local/mysql/support-files/mysql.server start

  停止MySql服务：
  sudo /usr/local/mysql/support-files/mysql.server stop

  重启MySql服务：
  sudo /usr/local/mysql/support-files/mysql.server restart