For each of the following pairs of expressions, give instances of relations thatshow the expressions are not equivalent. (r ⟖s)⟖t and r ⟖(s⟖ t) In other words, the natural right outer join is not associative.

Q: A relation R on a set S, defined as x R y if and only if y R x. This is an example of? a) reflexive…

A:

Q: Implement the following Racket functions: Transitive?   Input: a list of pairs, L. Interpreting L…

A: We need to write a Racket function to implement transitive function.

Q: define functions

A: Given :- In the above given question, the statement is mention in the above given question   Need to…

Q: ;; "relate" accepts a positive integer x and relation R and returns { y | (x y) €R }. ;; Type…

A: Helper Function : An helper function is a capacity that performs part of the calculation of another…

Q: Let R(A,B,C,D) be a relation with the set of functional dependencies F={AB->C,C->D). Decompose the…

A: Answer is

Q: Q # 3; (a). The relation ‘R’ is defined on the set M=(4,5,6,7) as the following;…

A: Given the relation R on M =(4,5,6,7) and given relation is R={(5,5),(5,6),(5,7),(6,5),(6,6),(6,7)}…

Q: How many minimal keys this relation has? A B C DE F G 1 4 4 4 2 4 3 2 5 4 4- 2. 4- 2. 3. 4. 2. 3. 4-…

A: Given that how many minimal keys this relation has? actually it required 6 keys to give a relation…

Q: B.  Draw the digraph of the relation on {a, b, c, d} 1.  {(a, b), (b, b), (b, c), (c, d), (d, a)}…

A: Digraph is a directed graph consists of a set of nodes and set of ordered pairs called edges. Here,…

Q: Every aggregatic

A: Every aggregation relationship is an association Aggregation is a type of linkage between two or…

Q: Sorry but I don't understand anything with your explication , can you please read the text and give…

A: This is not the correct solution as mentioned in the problem statement.   Here is the WRITTEN…

Q: Now start with these functional dependencies: АВ > Е C → D F → GH FG → GH В > FG Find a minimal…

A: A) AB ->E, C->D, F->GH, FG->GH, B->FG Here in FD FG->H, we can delete G from RHs…

Q: ind a minimal covering of these functional dependencies. Then use it to synthesize a set of…

A:

Q: Suppose that R is the following relation on the set A = {1,2,3,4}: R = A × A – {(1, 1), (2, 2), (3,…

A: The Cartesian product is a mathematical operation that takes two sets and creates a new set…

Q: Given the following relation R and its functional dependencies, what is the key of R? R(A, B, C, D,…

A: Key is basically which closure determines all the attributes A-->B B-->E E-->C Using…

Q: Apply the strongly connected component (SCC) algorithm described in the course to identify all the…

A: Pseudo Code: 1. For each vertex u of the graph, mark u as unvisited. Let L be empty. 2. For each…

Q: Consider the following Relation instance of R1(A, B, C, D): A D Null Null 1 Null Null 1 1 Null 1 2 4…

A: A relation stores data about entities using database languages. The structure of a relation is…

Q: Please excute the given SQL script…

A: Note: as per company guidelines we are supposed to answer only first 3-sub parts at a time. please…

Q: lation R on a set S, defined as x R y if and only if y R x. This is an example of? a) reflexive…

A: Introduction: A relation R on a set S, defined as x R y if and only if y R x. This is an example…

Q: Let R(A, B, C, D, E, F) be a relation with FD's: {D → C, C → D, D → E, C → E, E → AD, AF → E, D →…

A: Let R(A,B,C,D,E,F) be a relation with FD's  :…

Q: Implement the following Racket functions: Transitive?   Input: a list of pairs, L. Interpreting L…

A: # function to check transitive relation def is_transitive(relation):     # for all (a, b) and (b, c)…

Q: Q5) Consider the following Relation (T) which is a bag(Recall our discussion about bags an sets) P 1…

A: Relational Algebra which refers to the one it is a procedural query language which also it takes a…

Q: Let R(A, B, C, D, E, F) be a relation with FD's: {D → CE, C → BDE, E → AD, AF → E, B → D Which of…

A: Candidate keys is {F} Here for X->Y, the relation will be in 3nf if X is a super key or Y is one…

Q: DB_Design:GA7.5. 3NF Decomposition 2 Consider the functional dependencies on R(A,B,C,D,E,F):…

A: Database normalization is a crucial concept in the design and organization of relational databases.…

Q: 1. Suppose that you have the relation R with n tuples and the relation S with k tuples without…

A:

Q: Question 15 Please choose the answer wisely.

A:

Q: What ů co- vovi ance 6 Suppose if there are 20 studenta Peight and weight are consistent then it is…

A: The Answer is

Q: v) Choose all the functional dependencies that holds in the following table a. A → B b. BC c. BA d.…

A: We need to find all the options that holds a functional dependency in the given table. We have 5…

Q: let R be a relation defined on the set z by aRb if a < b. What property/properties are violated? A.…

A: EXPLANATION: Any relation R that is defined on a set A can be reflexive or symmetric or transitive…

Q: Let R be the relation on A = {1,2,3,4,5} where R = {(1,1),(1,3),(1,4),(2,2),(3,1),(3,3),(3,4),…

A: Here is the solution which is mentioned below:

Q: Q2: Given relation R with attributes (A, B, C, D, E, F). Give all the keys of R if the functional…

A: Given relation R(A, B, C, D, E, F)   Functional Dependencies: AB → C,  CD → E,  E → F   A, B, D do…

Q: Given: Relation R = {(a,a), (a.b), (b,a). (b,b). (c,c)} and Set S = {a, b, c} Complete Relation R…

A: Find the answer given as below :

Q: Express the following table of data as a relation S. x,0,2,3,5,7 y,4,2,-2,-5,-6 The correct answer…

A: A relation is a set of ordered pairs, where each ordered pair consists of an element from the first…

Q: Let R(A,B,C,D,E) be a relation with the following set of functional dependencies F={A->B,…

A: Given, Functional dependencies: A→B AC→E BC→D From the above functional dependencies, Closure of AC…

Q: Which of the following staterments is not correct? O f the relation R on a set A is reflexive then…

A: Sort Answer: option 1 is correct. If the relation R on a set A is reflexive then the complement…

Q: DATABASE SYSTEM A relation R is given which is R(A,B,C,D,E). It has the following functional…

A: BC  -&gt; ADE , D -&gt; B primary key is (BC) because: Closure of (BC)+ = {A, B, C, D, E} here, the…