MySQL high version report SQL_ mode=only_ full_ group_ By exception

Recently, there is a need for statistical data operation , You need to use the function of grouping and count , Here is the report sql_mode=only_full_group_by
stay mysql There are relevant descriptions on the official website

Error number: 3087; Symbol: ER_WRONG_FIELD_WITH_GROUP_V2; SQLSTATE: HY000
Message: Expression #%u of %s is not in GROUP BY clause and contains nonaggregated column '%s' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

The above prompt means sql_mode The problem of incompatibility , Here's the solution
This error usually occurs in mysql 5.7 as well as 5.7 In the previous version , The reason is mysql In the default configuration of ,sql_mode=“ONLY_FULL_GROUP_BY” This configuration is strictly enforced ‘SQL92 standard ’, So high website maintenance personnel are upgrading mysql version , Will be modified sql_mode Configuration of , Make it compatible with .

Temporary treatment sql_mode

Query Global sql_mode

SELECT @@GLOBAL.sql_mode;
# Set up 
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';

But this temporary solution , restart mysql The above problems will also appear

Modify by configuration

There has been linux For example ：
modify /etc/my.cnf

stay [mysqld] Add the following configuration ：

[mysqld]
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION

After modification , restart mysql that will do

service mysqld restart

It's going on group by The operation will be successful ！