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Ranchu33315dPeople in my CD course said that.
I made them shut up.
It was fun
netikras1790215dZero is a value meaning ZERO.
Null is a lack of any value. It's not even zero.
Trithon90315dzero: no pizza left in the box
null/nil: not even a box
IntrusionCM77415dSQL null is a state, not a value.
Zero is a quantity and as such a value.
And as you cannot compare a value like zero with a non value like null, 3 valued logic was born...
Zero is the lack of knowlege
Null is your brain