HighlightSQL Basics, day by day · Day 11
NULL is an unanswered RSVP card: it is not yes, not no, and not a blank you can count as either one.
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The image has the link printed on it, so it still leads back here.
This is one tell — the giveaway that AI is bluffing. It comes from SQL Basics, day by day, a short daily course on Noesa. Anyone can use AI; few can tell when it's wrong.