I’ve talked about NULLs before. (Ref: Here’s a bit on ISNULL(), and here’s one about understanding NULL at a basic level.)  And yet, it’s worthwhile to bring these things up from time to time. “[Thing] != NULL” is nonsense. It won’t work the way you want it to work, because NULL literally means “unknown”. Nothing in the … Continue reading “Thing IS NOT NULL” isn’t the same as “Thing != NULL” →