engineering recuitment GATE CSE 2023-24 Test Series DBMS Integrity Constraints and Normal Form Functional Dependency
Which of the following is true for the below given functional dependencies of the relation R(X, Y,Z,W) and S(X, Y, Z, W)?
R: {X → Y, XY → Z, W → XZ, Z → W}
S: {X → YZ, W → XY}
I. R ⊇ S
II. S ⊇ R
1
Only I
2
Only II
3
Both I and II
4
None of these