> We added `sql_mode` in [a19505e](https://github.com/django/django/commit/a19505eb2ecd4a07ff39f3f66898e68b69d0e680), it doesn't exists in Django 3.0. I think it's fine to always skip this test on MySQL because we use `ONLY_FULL_GROUP_BY` (default in MySQL 5.7+) in CI.    Ah, okay. I wasn't aware of that.