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Questions about demorgans-law

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Questions - demorgans-law

I've read "or" predicates can cause poor SQL server performance, can demorgans save me?

So I've heard/read before that SQL server can get confused with or predicates, generally when an or is provided sql server will actually have run the query twice (one with each side of the or predicat...
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Sidney

sql

performance

demorgans-law

Votes: 0

Answers: 1

Latest Answer

generally when an or is provided sql server will actually have run the query twice (one with each side of the or predicate) and concatenate/intersect the result sets If you had to find the lines in ...
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Schwern

Why is Q → P a logical consequence of ¬(P → Q )

I don't want to ask my professor about this because I'm awful at this and he's not the, uhh, patient type of professor to say the least. ANYWAY, it was my understanding that ¬(P → Q ) and (¬P → ¬Q ) m...
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Daniel K.

logic

first-order-logic

demorgans-law

fitch-proofs

Votes: 0

Answers: 1

Latest Answer

Perhaps some more background - by logical consequence we usually mean the semantical notion of the entailment operator: the entailment A ⊨ B holds if B is true in all models in which A is true. In cla...
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lambda.xy.x

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