MySQL错误处理

[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_schema.PROFILING.SEQ' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

sql _mode中only _full _group _by不兼容的问题

$ SHOW VARIABLES LIKE "sql_mode";
$ SET sql_mode='';
$ SHOW VARIABLES LIKE "sql_mode";

$ SHOW VARIABLES LIKE "sql_mode"; 
$ SET sql_mode='NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES';
$ SHOW VARIABLES LIKE "sql_mode";

---

SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column xxx which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

• 错误原因

对于GOUP BY聚合操作，如果在SELECT中列没有在GROUP BY中出现则认为SQL是不合法的，因为列不在GROUP BY子句中所以设置了sql_mode=only_full_group_by的数据库，在使用GROUP BY时会报错。

• 错误查询

mysql> SELECT VERSION();
+------------+
| VERSION()  |
+------------+
| 5.7.22-log |
+------------+
1 row in set


mysql> SELECT @@sql_mode;
+-------------------------------------------------------------------------------------------------------------------------------------------+
| @@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 |
+-------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set

查看当前sql_mode配置中是否出现ONLY_FULL_GROUP_BY选项

• 解决方案

永久去除：从MySQL主配置文件my.cnf的sql_mode选项中剔除ONLY_FULL_GROUP_BY选项

$ vim /etc/my.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

$ service mysqld restart

临时去除：在MySQL命令行执行设置sql_mode选项，选项中不包含ONLY_FULL_GROUP_BY。

mysql> SET sql_mode ='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
Query OK, 0 rows affected