There is an issue with Test Cases.
The following code is wrong but it is able to bypass the test cases:

-- IN WHERE WITH SPECIAL_SALES
SELECT DISTINCT d.* FROM departments d, sales s WHERE d.id = s.department_id and s.price > 90 ORDER BY d.id;

I suggest to remove SQL comments before checking the code.

Random tests are broken.
Previous comments are still actual.
Can anybody fix it?

Kata: SQL Basics: Group By Day

I have one failure during its execution. Here is test-case message:
"
should should return the expected results
✘ expected true to respond to true? or perhaps you meant be true or be_truthy
"

Does it connected with my code?