Consider a schema R, a set F of functional dependencies on R, and two candidate keys (k1, k2) as follows R= (A,B,C). F = {B →C,AC –→ B}. ki = AC. k2 =AB. (a) Is R in BCNF?
Q: Consider, for instance, the database used by an airline, which implements snapshot isolation as part…
A: Given: Take into consideration a database for an airline, whereby the underlying database system…
Q: Consider the schema R = (A, B, C, D, E, G) and the set F of functional dependencies:AB → CDB → DDE →…
A: Part(1) AB is basically not the superkey for R, and nor the AB -> CD trivial. Therefore, start…
Q: Define two sets: a letter set A = {t. p. c) and a word set B = {proposition, math, proof, discrete).…
A:
Q: Consider the schema R = (A, B, C, D, E, G) and the set F of functional dependencies:AB → CDADE →…
A: (a) We can observe that the right side part of functional dependencies that attributes are C, D, E G…
Q: 7.21 Give a lossless decomposition into BCNF of schema R of Exercise 7.1. (see 7.1 below) (7.1) :…
A: decompose the schema R = (A, B, C, D, E) into (A, B, C) (A, D, E). Show that this…
Q: c) Consider the following relation R with the functional dependencies: AC B, AD E, AB C, E→F, BC A,…
A: Given functional dependencies, AC→BAD→EAB→CE→FBC→AB→D
Q: Consider a schema R={A,B,C,D,E} and the following set of functional dependencies: {AB-> C,…
A: To find whether the relation is in BCNF or not, it must fulfill all the conditions given…
Q: Consider the issue of interesting orders in optimization. Suppose you are given a query that…
A: The interesting order is every order on the subsets of the attributes which can potentially take…
Q: List all the ordered pairs in the relation R = {(a, b) | a divides b} on the set {1, 2, 3, 4, 5, 6,…
A: Suppose you have a pair of two numbers. You have to find the pairs were a%b = 0 For the given sets,…
Q: Find a minimal cover in a standard form for the relation schema R(A, B,C, D, E, F, G, H) with the…
A: A minimal cover or canonical cover means a minimum set of functional dependencies. A canonical cover…
Q: Consider the schema R = (A, B, C, D, E, G) and the set F of functional dependencies:AB → CDADE →…
A: Given schema R = (A,B,C,D,E,G) and set of FD's are F = AB --> CD…
Q: Consider the following database schema for University Library database. A student can borrow many…
A: Select ISBN,Title,Author from BOOK where title like '%Database%' order by ISBN Desc;
Q: 1. If we project the relation R(A,B,C,D,E) with dependencies A→→BC, B→D, and C→→E onto S(A,C,E),…
A: Answer is given below-
Q: Consider the schema R = (A, B, C, D, E, G) and the set F of functional dependencies:AB → CDADE →…
A: Given schema R = (A,B,C,D,E,G) and set of FD's are, F = AB --> CD…
Q: Self Study Examples: Try to code listing for the Primary-Foreign key relations of the sets given…
A: Answer: I have done code and also I have attached code and code screenshot as well as output
Q: Consider the schema R = (A, B, C, D, E, G) and the set F of functional dependencies:AB → CDADE →…
A: Candidate Key: A minimal super key is known as the Candidate key. Superkey refers to the attributes…
Q: Crash consistency Explain two specific scenarios of problems that can happen if the system…
A: Given: Crash consistency Explain two specific scenarios of problems that can happen if the system…
Q: Consider the schema R = (A, B, C, D, E, G,H) and the set F of functional dependencies:AB → CDD → CDE…
A: Given:- schema R = (A, B, C, D, E, G,H) set F of functional dependencies:AB → CDD → CDE → BDEH →…
Q: Consider a database organized in the form of a rooted tree. Suppose that we insert a dummy vertex…
A: Answer: Consider the given modification in the database organized as a rooted tree.
Q: serializability
A: Version-vector Scheme A version vector is a method for monitoring data changes in a distributed…
Q: Given 5 dimensional parameters A, B, C, D, E, F and the following set S of functional dependencies S…
A: The set of functional dependencies are given as follows- S={B→A;C→B;F→E;B→F;F→D}; Let us find the…
Q: Let's suppose, a relation R=(A, B, C, D, E. H) with a set of functional dependencies F: (AE->BC, B…
A: Functional dependency is a DBMS concept . In this attributes of relations are dependent on each…
Q: R = ABCD F3{C-D, C-А, В -С } A. Find all candidate keys. B. What is the strongest normal form that…
A: A) Attribute or set of attribute that can determine all the attribute of relation R is key of R.…
Q: Consider a relational scheme R(A,B,C,D,E,H)R(A,B,C,D,E,H) and functional dependencies…
A: Given relational schema is R(A,B,C,D,E,H) Functional dependencies A→B,BC→D,E→C,D→A Candidate key…
Q: Consider a schema R = {A,B,C,D,E}and the following set of functional dependencies: {AD->B,…
A: If there is any relation R and we have to check whether the relation is in Boyce–Codd Normal Form…
Q: Computer science From a DBMS class Consider the query al and he2 and d -3 (R) on the relation…
A: Solution:: 1.cost of checking all conditions through a table scan + filter step is B(R) =…
Q: Consider the following database schema for a library. Book (BookID:int, BookTitle:string(unique),…
A: No, It Is Not Possible to have a Borrowing-Record with an unknown CustomerCPR.
Q: Consider a schema R = (A, B, C, D, E). Assume that the following set F of functional dependencies…
A: (CD)+ is CD closure which gives the set of all regular Functional Dependencies that can be derived…
Q: Consider the schema R = (A, B, C, D, E, G) and the set F of functional dependencies:A → BCBD → ECD →…
A: Given schema R with the FDs: -
Q: Is it feasible to have two clustering indices on the same relation that are used for distinct search…
A: An index offers link to data with a specified value. Indices make search faster. A clustering index…
Q: 2.Consider relation R=(A,B,C,D) with the following FDs: B → C, C → D, and D → A a. List all…
A: 2. Given, Relation is R = (A, B, C, D) The set of functional dependencies given is : B -> C C…
Q: Let R1, R2,…, Rn be a decomposition of schema U. Let u(U) be a relation, andlet ri = ΠRI(u). Show…
A: Given, R1, R2,…, Rn be a decomposition of schema U u(U) is a relation ri = ΠRI
Q: Suppose there are two relationsr and s, such that the foreign key B of r references the primary key…
A: Consider the given two relations r and s and their on delete cascade constraint as the primary key…
Q: Using the functional dependencies of Exercise 7.6, compute the canonicalcover Fc.
A: Using the functional dependencies of Exercise 7.6, compute the canonicalcover Fc. Hence I have found…
Q: c. For a schema R (A, B, C, D) bearing FDs F={A B, B + C, C + D, D + A}, find if the decomposition…
A: for dependency preserving, F1 U F2 = F where F1 is the functional dependency of R1 F2 is the…
Q: Consider a schema R = {A,B,C,D,E}and the following set of functional dependencies: {AB → C,C → D,D →…
A: To find: To find whether the given function is Boyce-Codd normal form or not.
Q: Consider a schema ? = {?,?,?,?,?} and the following set of functional dependencies: {?? → ?, ? → ??,…
A: Finding if the relation is in BCNF or notFor finding if the relation is in BCNF or not then it must…
Q: Implement in Python / Java
A: Lossless JOIN property allows to create a table of relations and insert values in the form of bij…
Q: Distinguish between the main key-based definitions of 2NF and 3NF and the generic definitions. Give…
A: 2NF: This stipulates that a relation in first normal form should not have any non-prime…
Q: Suppose that we decompose the schema R = (A, B, C, D, E) into (A, B, C) (A, D, E). Show that this…
A: The given functional dependencies are as follows. A → BCCD → EB → DE → A Consider the decomposed…
Q: Consider a relational scheme R(A,B,C,D,E,H) and functional dependencies A→B,BC→D,E→C,D→A. Find all…
A: In the functional dependencies above E, H are not present at the right hand side hence a candidate…
Q: Consider the schema R = (A, B, C, D, E, G) and the set F of functional dependencies:AB → CDADE →…
A: Given schema is: R = (A,B,C,D,E,G) whereas set of functional dependencies are: Candidate Key: The…
Q: initions of 2NF and 3NF differ fro
A: Below the major key-based definitions of 2NF and 3NF differ from the generic definitions of 2NF and…
Q: Consider a relational scheme R(A,B,C,D,E,H)R(A,B,C,D,E,H) and functional dependencies…
A: The Answer is
Q: Given the schema S= , where F represents the following dependencies: AB→D A→D E→B B→H H→C E→C…
A: A functional dependency which refers to the relationship between two attributes and typically which…
Q: Consider replacing F by an alternative set of functional dependencies G: AP-> IT I -> ATP Is the…
A: The Answer is in step-2.
Q: Consider the schema R = (A, B, C, D, E, G, H) and the set F of functional dependencies:AB → CDD →…
A: 3NF decomposition: Any relation is said to be in 3NF if it follows following characteristics: The…
Q: Suppose two relationsr and s have histograms on attributes r.A and s.A, respectively, but with…
A: Find the largest unit u that evenly divides the range size of both histograms. Divide each histogram…
Q: Suppose R(A,B,C,D,E) and we have the functional dependencies F= { A->C, C->D, B->C, DE->C, CE->A }
A: Functional Dependency A functional dependency A->B in a relation holds if two tuples having same…
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 2 images
- Consider a schema R, a set F of functional dependencies on R, and two candidate keys (k1, k2) as follows: R=(A,B,C). F = {B → C,AC → B}. ki = AC. %3D k2 =AB. (b) Is R in 3NF?Consider a schema R and a set F of functional dependencies as follows: R= (A,B,C,D,E,G). F = {A → BCD, BC DE,B→D,D→A}. Prove that AG is a superkey for R.Implement in Python / Java Algorithm: Testing for lossless (nonadditive) join property. Input: A universal relation R, a decomposition D = { R1, R2, R3, ….. Rm } of R, and a set F of functional dependencies. 1. Create an initial matrix S with one row i for each relation in Ri in D, and one column j for each attribute Aj in R. 2. Set S(i, j) := bij for all matrix entries. (* each bij is a distinct symbol associated with indices (i, j) * ) {for each column j representing attribute Aj {if (relation Ri includes attribute Aj ) then set S(I, j):=aj;};}; (* each aj is a distinct symbol associated with index (j) *) 3. For each row i representing relation schema Ri {for each functional dependency X → Y in F {for all rows in S which have the same symbols in the columns corresponding to attributes in X {make the symbols in each column that correspond to an attribute in Y be…
- Let A={1,2,3} and B={4,5,6}. The set X={(1,4),(3,6),(2,4),(1,5)} is: O a relation between from A to B, but NOT a function from A to B O a set that has nothing to with A and B O equal to AxB O a function from A to BConsider the schema R = (A, B, C, D, E, G) and the set F of functional depen-dencies: AB → CDADE → GDEB → GCG → DE Use the 3NF decomposition algorithm to generate a 3NF decomposition of R,and show your work. This means:a. A list of all candidate keysb. A canonical cover for F, along with an explanation of the steps you tookto generate itc. The remaining steps of the algorithm, with explanationd. The final decompositionDefine two sets: a letter set A = {t. p. c) and a word set B = {proposition, math, proof, discrete). Define the relation R = A x B such that (letter, word) is in the relation if that letter occurs somewhere in the word. Choose the correct relation R. O R = {(t, proposition), (t, proof), (p. proposition), (p. proof), (c, math), (c, proof)} O R = {(t, math), (p, proposition), (p, math), (p, proof), (c, math), (c, proof)} O R = {(t, proposition), (t, math), (t, discrete), (p. proposition), (p, proof), (c, discrete)} OR = {(t, discrete), (p. proposition), (p, math), (p. proof), (c, math), (c, discrete)}
- Given: Relation R = {(a,a), (a.b), (b,a). (b,b). (c,c)} and Set S = {a, b, c} Complete Relation R to be Transitive with Set SConsider the schema R = (A, B, C, D, E, G,H) and the set F of functional dependencies:AB → CDD → CDE → BDEH → ABAC → DCUse the 3NF decomposition algorithm to generate a 3NF decomposition of R,and show your work. This means:a. A list of all candidate keysb. A canonical cover for Fc. The steps of the algorithm, with explanationd. The final decomposition1. A known relationship mode of R (U, F), U= (c, t, h, r, s, g, q); F={c->tq, cs->g, ht->r,hr->c, hs->r}; find the minimum cover of F, then use the Normal Form decompositionalgorithm to standardize this mode to 3NF, and check if the decomposition has thenonadditive join property.
- List all the ordered pairs in the relation R = {(a, b) | a divides b} on the set {1, 2, 3, 4, 5, 6, 7, 8}.Can renaming be pushed through join and selection—that is, which of the following algebraic laws hold? ρN (RS) = ρN (R)ρN (S) , ρN (σC (R)) = σC (ρN (R)) In each case, support your answer by an example (i.e., give relations and parameters so that the expressions on the two sides of = are equal or non-equal). If your answer is no, additionally impose restrictions on the parameters (i.e., N and C) so that the law holds.Vector space-based classification methods tend to be poor choices for problem sets definedover purely nominal feature sets. Do you agree or disagree with this statement? What would be yourmethod of choice for ML classification on nominal data? Explain both the above questions in details?