Stdle #40 · nulls · 2026-07-16
What does SELECT COALESCE(NULL, NULL, 'x', 'y'), IFNULL(N… output?
A past puzzle — fully playable. 4 attempts, hints on wrong guesses.
SELECT COALESCE(NULL, NULL, 'x', 'y'), IFNULL(NULL, 0), IFNULL(7, 0)NULLs