MySQL-this is incompatible with sql_mode=only_full_group_by

tags: Pitfalls encountered in the learning process Record SQL statements encountered during work and study

Today, I wrote a multi-table query using MySQL 5.5 locally, and the result was reported on the server MySQL-this is incompatible with sql_mode=only_full_group_by
It was later discovered that it was the 5.7 version of MySQL used by the server

The default sql configuration of mysql 5.7 version is: sql_mode="ONLY_FULL_GROUP_BY", this configuration strictly implements the "SQL92 standard". Since the ONLY_FULL_GROUP_BY setting is turned on, if a field does not appear in the target list and group by fields at the same time, or is the value of an aggregate function, then this SQL query is considered illegal by mysql and an error will be reported.

Of course the solution is very simple. You can use the following statement to query your sql_mode
SELECT @@GLOBAL.sql_mode;

The mysql configuration file needs to be modified, and the ONLY_FULL_GROUP_BY attribute is not required by manually adding sql_mode.
MySQL configuration file my.cnf is located in the etc folder,

vi  /etc/my.cnf

Move the cursor under vim to the position shown in the figure below, add the following code and save and exit: wq and then restart MySQL

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

Attachment: CentOS7 commonly used MySQL commands

View service status service mysqld status
Start the command service mysqld start
Shut down the command service mysqld stop
Restart command service mysqld restart
View MySql system configuration file cat /etc/my.cnf
Edit MySql system configuration file vi /etc/my.cnf

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