Homework Help: database

Posted by SUE 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)))?

No one has answered this question yet.

Answer this Question

Related Questions

calculus - The parametric curve x(t)=3cos(t) y(t)=7sin(2t) intersects itself at ...
math - The forward difference formula can be expressed as : f'(x0) = (1/h)[f...
finitemath - Find an equation of the line containing the given pair of points (3...
calculus - Given the differential equation: dy/dx = y(1+x), y(0)=1, Use Euler&#...
Calculus - Given the differential equation: dy/dx = y(1+x), y(0)=1, Use Euler&#...
Math - extrapolation - The forward difference formula can be expressed as : f&#...
calc check please? - Given the differential equation: dy/dx = y(1+x), y(0)=1, ...
calc check: euler's method - Given the differential equation: dy/dx = y(1+x...
Physics - def of average velocity = t^-1 (x - x0) (average velocity = t^-1(x-x0...
TO BOBPURSLEY - def of average velocity = t^-1 (x - x0) (average velocity = t^-1...

For Further Reading

First Name:
School Subject:
Answer: