Let R(a, b, c); S(a, b, c) and T(a, b, c) be three relations. Write one or more Datalog rules that define the result of each of the following expressions of relational algebra: (RUS) - T (R - S) n (R - T)
Added by Julie T.
Step 1
First, we need to find the union of R and S: R ∪ S. We can represent this in Datalog as: UnionRS(x, y, z) :- R(x, y, z) ; UnionRS(x, y, z) :- S(x, y, z). Show more…
Show all steps
Your feedback will help us improve your experience
Akash M and 93 other AP CS educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Using only De Morgan's relationships and Involution to find the complements of the following function: f(A,B,C,D) = AB'C + (A'+B+D)(ABD' +B') Using just the definition of the dual of a Boolean algebra expression, find the duals of the following expression: f(A,B,C,D) = AB'C + (A'+B+D)(ABD' +B')
Sri K.
Hoan N.
Let S = {1, 2, 3, 4, 5} and A = S × S. Define the following relation R on A: (a, b) R (c, d) if and only if a - b = c - d. Prove that R is an equivalence relation.
Linda H.
Recommended Textbooks
Computer Science and Information Technology
Introduction to Programming Using Python
Computer Science - An Overview
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD