Which of the following relations cannot be decomposed into BCNF with a lossless join and dependency-preserving decomposition?

Given a relation scheme R (x, y, z, w) with functional dependencies set F = {x → y, z → w}. All attributes take single and atomic values only.
A. Relation R is in First Normal Form.
B. Relation R is in Second Normal Form.
C. Primary key of R is xz.
Choose the correct answer from the options given below.

Consider the following statements:
Statement I: Conservative 2 PL is a deadlock-free protocol.
Statement II: Thomas's write rule enforces conflict serializability.
Statement III: Timestamp ordering protocol ensures serializability based on the order of transaction timestamps.
Which of the following is correct?

In a database, a rule is defined as (P1 and P2) or P3? R1 (0.8) and R2 (0.3). Where P1, P2, P3 are premises and R1, R2 are conclusions of rules with certainty factors (CF) 0.8 and 0.3 respectively. If any running program has produced P1, P2, P3 with CF as 0.5, 0.8, 0.2 respectively, find the CF of results on the basis of premises.

In a schema R (A, B, C, D, E, F, G, H), each field of R contains only atomic values.
F = {CH→ G, A → BC, B→CFH, E→A, F→EG} is a set of functional dependencies so that F + is exactly the set of FDs that holds R. The relation R is.

Consider a schema R(P, Q, R, S) and the following functional dependencies P→Q, Q→R, R→S, S→Q. Then decomposition of R1(P, Q), R2(Q, R) and R3(Q, S) is:

What of the following best describes the structure of a relational database?

Consider a relation schema R = (U, V, W, X, Y, Z), on which the following functional dependencies hold:
{U → V, VW, → X, Y → W; X→U}
The candidate keys of R are:

Which of the following relations cannot be decomposed into BCNF with a lossless join and dependency-preserving decomposition?

Given a relation scheme R (x, y, z, w) with functional dependencies set F = {x → y, z → w}. All attributes take single and atomic values only.
A. Relation R is in First Normal Form.
B. Relation R is in Second Normal Form.
C. Primary key of R is xz.
Choose the correct answer from the options given below.

Consider the following statements:
Statement I: Conservative 2 PL is a deadlock-free protocol.
Statement II: Thomas's write rule enforces conflict serializability.
Statement III: Timestamp ordering protocol ensures serializability based on the order of transaction timestamps.
Which of the following is correct?