Consider a relation R(A, B, C, D) with functional dependency set F = {AB -> C, C -> D, D -> A}. What are the candidate keys of R?

In concurrency control, the phantom phenomenon (phantom tuple problem) occurs when:

Let P, Q, R and S be the attributes of a relation in a relational schema. Let X → Y indicate functional dependency in the context …

In the context of relational database normalization, which of the following statements is/are true?

Consider a relational database schema with two relations R(P,Q) and S(X,Y). Let E = {<u> | there ∃ v, there ∃ w, <u,v> in R and <v…

Consider a relational database schema with a relation R(A,B,C,D). If {A,B} and {A,C} are the only two candidate keys of the relati…