March 22, 2017

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Posted by on Tuesday, April 21, 2009 at 3:21pm.

Prove that for any relation R(X,Y)
Select Select(R (X=x0) (Y=y0))) =
Select (R(X=x0) and Y=y0))
What is an equivalent form of (Select(R (X=x0) or (Y=y0)))?

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