mysql报错In aggregated query without GROUP BY

Execution statement:
select de.dept_no, count(s.salary) from salaries s left join dept_emp de on s.emp_no = de.emp_no;

Complete error message:
In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'demos.de.dept_no'; this is incompatible with sql_mode=only_full_group_by

After searching for information, the problem is that there will be this error in Mysql version 5.7 and above, just change it sql_mode.

# 查看sql_mode
select version(), @@sql_mode;

# 更改sql_mode
SET sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

After changing the settings, the problem is solved.

Reference blog:
https://cloud.tencent.com/developer/article/1404739