MySQL prompt: In aggregated query without GROUP BY, expression #1 of SELECT list contains ......

Preface

Operating todaymysqlWhen querying data in the database, a prompt is encountered, the query fails, and the prompt message is as follows:

In aggregated query without GROUP BY, expression #2 of SELECT list contains nonaggregated column 'myemployees.employees.department_id'; this is incompatible with sql_mode=only_full_group_by

When running this SQL statement, there is no problem:

select MIN(salary)
from employees
where department_id=(
	select department_id
	from employees
	group by department_id
	order by MAX(salary) asc
	limit 1
);

But added a field abovedepartment_id, When running this, the above error message appears:

select MIN(salary),department_id
from employees
where department_id=(
	select department_id
	from employees
	group by department_id
	order by MAX(salary) asc
	limit 1
);

After understanding, inMySQL5.7.5, It’s turned on by defaultONLY_FULL_GROUP_BY, Which led to some of the previousSQLCan’t execute normally, in fact, it’s oursSQLCaused by irregularities becausegroup byAfter that, some of the returned data is uncertain, so this error occurs.

To sum up a sentence:that's becausesql_modeCaused by improper settings.

Resolution process

Here is the solution:

I usedNavicatConnected inNavicatEnter the following statement:

select version(), @@sql_mode;  //This step is to check

After that, enter the following command:

SET sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));  //Modify sql_mode

Just got an error when running againSQLCommand, this time it can run normally.

Expansion:

MySQL modify sql_mode

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