Mysql: MySQL-this is incompatible with sql_mode=only_full_group_by error resolution

First, the background

Previously used local server in development, local is mysql5.6, there is a problem when switching to online server

Prompt MySQL-this is incompatible with sql_mode=only_full_group_by

After the query, the mysql version on the server is mysql5.7.

Second, the problem description

I found the reason after I searched online.

First, the principle level

 This error occurs in mysql version 5.7 and above issues:

 The default sql configuration for mysql version 5.7 is: sql_mode="ONLY_FULL_GROUP_BY", this configuration strictly enforces the "SQL92 standard".

 Many upgrades from 5.6 to 5.7, in order to be grammatically compatible, most will choose to adjust sql_mode to keep it consistent with 5.6, in order to be as compatible as possible.

   Second, the sql level

 This reason occurs when sql is executed:

 To put it simply: the result of the output is called target list, which is the field followed by select, and there is a place group by column, which is

 The group followed by the field. Since the setting of ONLY_FULL_GROUP_BY is turned on, if a field is not in the target list

 And the group by field appears at the same time, or the value of the aggregate function, then this sql query is considered illegal by mysql, will report an error.

Third, the solution

Need to modify the mysql configuration file, by manually adding sql_mode to force the specified ONLY_FULL_GROUP_BY attribute is not required

[root@darg90 /]# vi /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

[root@darg90 /]# service mysqld restart
Stop mysqld: [OK]
 Starting mysqld: [OK]
[root@darg90 /]#

Restart the mysql server to test again, the problem is solved!

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