In how many languages is Null not equal to anything not even Null?
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It’s this way in SQL (as a logic language) because null means unknown/undefined.
However, in programming languages (like say, C++ or C#), a null pointer/reference is a specific value with a specific meaning — nothing.
Two nothings are equivilent, but two unknowns are not. The confusion comes from the fact that the same name (null) is used for both concepts.