In mysql 5.7 sql mode ONLY_FULL_GROUP_BY is enabled by default. Which means that, your select list must be in your aggregate(GROUP BY/ Having) function. See the details from here https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html

Recently i faced this types of problem, my sql was exactly

SELECT * FROM `users` GROUP BY `user_level_id`

The problem on this query is that, i applied here GROUP BY only user_level_id, but my select list have all the fields which i mean using *, if i run the sql as below then it should work

SELECT `user_level_id` FROM `users` GROUP BY `user_level_id`

Cause the select list and GROUP BY list are same. If the sql as below, then it should also work

SELECT COUNT(id) AS total_id, user_level_id FROM `users` GROUP BY `user_level_id`

Now, if you need to get data with more fields, but can’t use them on GROUP BY clause then you can follow this way.

SELECT ANY_VALUE(id) id, user_level_id FROM `users` GROUP BY `user_level_id`