I don't get it either... I passed all the tests before clicking the Attempt button but then once I cick Attempt, I fail 1 test, of not getting the same results as them. So my failure is same as the one you explained. If you figure this out, please respond to this post. Thanks in advance!

Why is my query considered incorrect? Kata grader is telling me my answer does not match their results (that's why I didn't mark this as spoiler, sorry):
SELECT |/(CAST(number1 AS integer)) AS root,
CAST(log(10.0,CAST(number2 AS numeric)) AS float) AS log
FROM decimals;

I tried the PostgreSQL version of a square root function, |/number2 and still got this Kata incorrect because my results do not match the answer keys. My source: https://www.postgresql.org/docs/9.1/functions-math.html