Today, the project changed its system, reinstalled the MySQL database, and the data was reported incorrectly when the function was executed.

In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 're.name'; this is incompatible with sql_mode=only_full_group_by

Because there is no problem before changing the system, check the sql_mode=only_full_group_by on the Internet and find that the database itself is configured.

I am the database version is 5.7.24

Said this when I searched online.

Group by syntax:

Select selects the column in the group + aggregate function from table name group by grouped column

From the grammatical format, it is first grouped, and then the retrieved columns are determined. The retrieved columns can only be selected in the columns of the participating group.

Look at ONLY_FULL_GROUP_BY again: For the GROUP BY aggregate operation, if the column in the SELECT does not appear in the GROUP BY, then the SQL is not legal, because the column is not in the GROUP BY clause, that is, it is detected. The column must appear after group by or it will report an error, or this field will appear in the aggregate function.。

View the mysql version command:

select version();

View the sql_model parameter command:

SELECT @@GLOBAL.sql_mode;

SELECT @@SESSION.sql_mode;

Find:

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

The first item turns on ONLY_FULL_GROUP_BY by default.

Solution:

1. Select only the columns that appear after the group by, or add an aggregate function to the column; (not recommended)

2. Command line input:

set @@GLOBAL.sql_mode='';

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';

Turn off ONLY_FULL_GROUP_BY by default!

This time select select

SELECT @@sql_mode;

SELECT @@GLOBAL.sql_mode;

Found that there is no ONLY_FULL_GROUP_BY, it feels OK. But if you restart the Mysql service, you will find that ONLY_FULL_GROUP_BY will still exist.

To completely solve this problem, you have to change the my.ini configuration (if you mysql does not have this file, change my-default.ini to my.ini, my version is changed to my.cnf)

Add under [mysqld] and [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';

Vi edit my.cnf

Add at the bottom

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

Restart MySQL and query again