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Dealing with NULLs

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 Article Abstract:

(Arjen Lentz) I frequently see a question fly past on why an expression like WHERE col = NULL does not come up with the desired result, even though it superficially looks perfectly sane. To address this, we can recap some high school maths, and at the same time finally find out that some things learnt there are actually very practical and useful later in life... I mean, who would have guessed that learning about sets and Venn diagrams was really giving you the fundamentals of relational databases?

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