mysql group by 过滤字段 只能在SELECT 后面出现，不能写其他字段 报错解决 关键字 sql_mode=only_full_group_by

1：报错  关键字 sql_mode=only_full_group_by
mysql> select uuid,ip,count(*) from dbname_report.t_client_ips group by uuid limit 1;
ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'dbname_report.t_client_ips.ip' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

2：查看模式
mysql> select @@global.sql_mode
-> ;
+------------------------------------------------------------------------------------------------------------------------+
| @@global.sql_mode |
+------------------------------------------------------------------------------------------------------------------------+
| STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION |
+------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

3：设置模式

mysql> set @@global.sql_mode = 'STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION'
-> ;
Query OK, 0 rows affected, 2 warnings (0.00 sec)

mysql> select uuid,ip,count(*) from dbname_report.t_client_ips group by uuid limit 1;
ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'dbname_report.t_client_ips.ip' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
mysql> select @@global.sql_mode；

4：查看
+--------------------------------------------+
| @@global.sql_mode |
+--------------------------------------------+
| STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION |
+--------------------------------------------+
1 row in set (0.00 sec)

5：执行还是报错

6：修改数据库配置文件

cat /etc/my.cnf

[mysqld]

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

7：重启数据库，可以解决

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