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Javascript has both null and undefined and I'm not sure that's a good idea. At least in SQL we only have one of them, but it can mean unknown or it can mean N/A or even false. It's like a joker, what it means depends on how you use it.

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No, it's not those other things, that's just using the tool incorrectly. A NULL is definitely "we dont know", not false, not N/A, especially not any known value.

Except in every other programming language with a null, null is the definite absence of something

Sure, and we're talking about SQL nulls in this context, which is why I am strict in my definition.

Yes and I think that Clojure handles nil pretty well, and it's a functional programming language like SQL. It's also interesting to see that Typescript has added an unknown type. So something that's a value in SQL (null being unknown) is a type in TS.

Or VBA, which has Empty, Null, and Nothing:

https://excelbaby.com/learn/the-difference-between-empty-nul...

(and sometimes Missing)

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