Given a relational schema r(A, B, C, D), does A →→ BC logically imply A →→ B and A →→ C? If yes prove it, or else give a counter example.
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Given a relational schema r(A, B, C, D), does A →→ BC logically imply A →→ B
and A →→ C? If yes prove it, or else give a counter example.
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- Mapping er dig to Relational Model @* Give correct a correct Answer and get up vote else I will give downvoted...Consider following ER-Diagram of a LIBRARY which is used to keep track of books, borrowers, and book loans. Convert the given ER-Diagram to equivalent Relational Schema. Show Primary keys and Foreign keys in the resulting schema.Provide a normalized relational logical schema for the same database (N.B. It is not mandatory to report the restructured E-R diagram) Define referential integrity constraints for 2 relationships of your choice among those defined in the conceptual schema solution: CUSTOMER(FiscalCode, Name, Surname, Address, LoyaltyCard*, Type) INTOLERANCES(Intolerances, FiscalCode) TICKET(CodS, CodF, Date, FisclaCode, Price) SEAT(CodS, CodF, Class) FLIGHT(CodF, Departure, Arrival, Departure_date, Arrival_date, Airplane_type) Integrity constraints: SEAT(CodF) REFERENCES FLIGHT(CodF) TICKET(CodS, CodF) REFERENCES SEAT(CodS, CodF) TICKET(FiscalCode) REFERENCES CUSTOMER(FiscalCode) i provided the solution but i dont understand where it came from. when do we and when do we not consider the black circles in the diagram and if we do for what and on what basis do we consider them? what is type? what are the references and how do i understand which ones i should take and not? please explain every…
- Give a representation of the relational schema for part of the DreamHome case study.Let R be a relational schema with attributes {M, N, O, P, Q, R} and let F be the set of functional dependencies F = {MN→OP, O→Q, QR→N, R→P}. Prove whether R is in 3NF.Should the cardinality between entities be translated/read from both ends of the notation when dealing with database entity relationship modeling? To put it another way, can a connection between two things be comprehended by reading it both forward and backward?
- Decompose the relations, as necessary, into collections of relations that are in BCNF. R(A,B,C,D) with FD’s AB->C,C->D,and D->A. Could you show step by step procedure for this with detailed explaination?Should the cardinality between entities be translated/read from both ends of the notation when dealing with database entity relationship modelling? In other words, should a relationship between things be understandable when read both forwards and backwards?Can cardinality between individuals be translated/read from both ends of the notation while dealing with database modeling of relationships? In other terms, does a partnership between individuals understand to read back and forth?
- Please answer the following relational database question asap!! Consider the following relation schema R= {P, Q, S, T} and a set of functional dependencies Σ = {PQ->S, S->PQ, P->T}. Is R in the BCNF form with respect to Σ? If not, determine a BCNF decomposition for R and check if this BCNF decomposition is dependency-preserving.Consider a database containing two relations: R(A,B,C) and S(D,E,F). For each of three (your choice) of the 12 rewriting rules for relational algebra expression, give an example pair of relational algebra expressions involving R and S such that the rule rewrites one expression to the other expression, and give another example pair to show the rewriting rule cannot be used since some of the conditions for the rule arenot satisfiedDiscuss each of the following concepts in the context of the relational data model: (a) relation (b) attribute (c) domain
