Error scenario

Today, I have a project that I just came down on my computer. When I log in to enter the home page, I reported a string of this is incompatible with sql_mode = only_full_group_by error, I am sure that there will be this mistake before the company's computer, I At the beginning, I thought it was MySQL version, so I became a 5.7.16 version of my own 5.7.33 and the company's remote database. The error is still, so after a series of findings, finally solved, now to integrate sharing A look at my problem.

wrong reason

When using the group by statement above, this is this is incompatible with sql_mode = only_full_group_rmode error, which is due to the configuration of MySQL5.7 or above, default sql_mode = "only_full_group_by", can be written in the query:

select @@GLOBAL.sql_mode;

The result of querying is

only_full_group_by

This requires the field of SELECT lookups to be included behind the group By, below is example

select a,b from table group by a; (×)

select a,b from table group by a,b,c; (√)

The field of Group By can be more than SELECT, and can not be less than SELECT

 

Solution

Temporary modification

Enter in the query

set @@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;

This method will fail when restarting mySQL service.

2. Permanent modification

Under the root of MySQL, find my.ini files, if not, and other named INI files, such as My-Default.ini or MySQL.ini,Retain! Don't delete or replace!Otherwise, when you restart MySQL, you will not open the service, copy the existing profile to the current directory, and renamed My.ini, so that the root directory will have two profiles.

Then configure the following line under the [MySQLD] column.

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION

Let's put a specific content of my my.ini file.

[mysql]

# Set the MYSQL client default character set

default-character-set=utf8

[mysqld]

# Set 3306 port

port = 3306

# Set the mysql installation directory

basedir=D:\Tools\MySQL\mysql-5.7.16-winx64

# Set the storage directory of the data of the mysql database

datadir=D:\Tools\MySQL\mysql-5.7.16-winx64\data

# Allow the maximum number of connections

max_connections=200

# 8-bit encoded Latin1 character set

character-set-server=utf8

# The default storage engine that will be used when creating a new table

default-storage-engine=INNODB

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION

This is the execution in the query

select @@GLOBAL.sql_mode;

Give

Different in the mysql version, the effect is different

If other versions such as 8.0 are useless, put sql_mode = strict_trans_tables, no_zero_in_date, no_zero_date, error_for_division_by_zero, no_AUTO_CREATE_USER, NO_ENGINE_SUBSTITEN, NO_ENGINE_SUBSTITTION, NO_ENGINE_SUBSTITTION, NO_ENGINE_SUBSTITTION, NO_ENGINE_SUBSTITION

If you can't do it, you only keep strict_trans_tables, no_engine_substitution and try again

Finally, restart the MySQL service

 

If there is a mistake, welcome to correct