data base management systems
Consider a relation with schema S(A, B, C, D) with FD's A-t B, B -t C, and B ___.D. a) What are all the non trivial FDs that follow from the given FD's? You should restrict yourself to FD's with single attributes on the right side. b) What are all the keys of R? c) What are all the superkeys for R that are not keys?
Homework Answers
A Database Management System (DBMS) is a software tool designed to efficiently organize, manipulate, and manage databases. It enables users to define the structure of the database, insert, update, and retrieve data, and enforce data integrity and security measures. DBMS facilitates data management through the use of a standardized query language, such as SQL, allowing users to interact with the database seamlessly. It incorporates features for controlling access to data, ensuring concurrency control in multi-user environments, and maintaining data integrity through constraints. Additionally, DBMS includes backup and recovery mechanisms to prevent data loss in case of system failures. Providing a level of abstraction between the physical database implementation and user interactions, DBMS offers data independence and supports changes to the database structure without affecting applications. Examples of widely used DBMS include Oracle Database, MySQL, Microsoft SQL Server, PostgreSQL, and MongoDB. Overall, DBMS is a fundamental tool in modern information systems, supporting a range of applications and contributing to efficient data management and retrieval.
FD database Superkeys
R(A, B, C, D) with FDs A ? B, B ? C, B ? D(1) What are all the nontrivial FD’s that follow from the given FD’s? You should restrict yourself to FD’s with single attributes on the right side.(2) What are all the keys of R?(3) What are all the superkeys for R that are not keys?
Below are two relations. Each relation has a corresponding set of FDs that hold in the...
Below are two relations. Each relation has a corresponding set of FDs that hold in the relation. For each relation and corresponding FDs. answer these three questions: (i) What are all the nontrivial FDs that follow from the given FDs? List each FD with a single attribute on the right side. (ii) What are the keys of the relation? (iii) What are the superkeys for the relation that are not keys? Schemas and FDs: (a) R(A, B, C, D) with...
2. (15 points) Consider a relation with schema R(A,B,C,D) and FD= { AB->C, C->D, D- >A),...
2. (15 points) Consider a relation with schema R(A,B,C,D) and FD= { AB->C, C->D, D- >A), what are the keys of R? Hint: Consider the 15 possible non-empty subsets of attributes. First check if a set of attributes X in R is a super key of R. If X-> R then X is superkey of R. Then X is a super key and no subset of X is a super key, then X is a key - a minimum super...
Consider the following relations for course-enrollment database in a university: STUDENT(S-ID,S-Name, Department, Birth-date) COURSE(C-ID, C-Name, Department)...
Consider the following relations for course-enrollment database in a university: STUDENT(S-ID,S-Name, Department, Birth-date) COURSE(C-ID, C-Name, Department) ENROLL(S-ID, C-ID, Grade) TEXTBOOK(B-ISBN, B-Title, Publisher, Author) BOOK-ADOPTION(C-ID, B-ISBN) (a) Draw the database relational schema and show the primary keys and referential integrity constraints on the schema. (b) How many superkeys does the relation TEXTBOOK have? List ALL of them. (c) Now assume each COURSE has distinct C-Name. (i) If C-ID is a primary key, what are the candidate keys and the unique keys...
Question 1: Functional Dependencies [7 marks Consider a relation R on attributes (A, B, C, D,...
Question 1: Functional Dependencies [7 marks Consider a relation R on attributes (A, B, C, D, E, F,G, H) and the following functional dependen- cies. B →G C →D DE →GC → EF DEF → H (a) What is the closure of [F, G, Hy? (b) List all of the candidate keys of R under the dependencies above. (c) List all of the FDs above that are 3NF violations (d) List all of the FDs above that are BCNF violations....
please do question 4. Note that we follow the convention of denoting the set of attributes...
please do question 4.
Note that we follow the convention of denoting the set of attributes {A, B, C} by ABC when we write FDs but not when we write schemas. Given the following set set F of FDs on schema R= (A, B, C, D, E,G): A + BC AB + CD B +C E →D G +C EG → AD Answer the following questions. Questions 1-4 require a formal proof or disproof. A proof may be given either...
Let R(A, B, C, D, E) be a relation wit FDs F = {AB->C, CD->E, E->B,...
Let R(A, B, C, D, E) be a relation wit FDs F = {AB->C,
CD->E, E->B, CE->A}....
Question 4 Not yet answered Marked out of 2.00 P Flag question Let R(A,B,C,D,E) be a relation with FDs F = {AB-C, CD-E, E-B, CE-A} Consider an instance of this relation that only contains the tuple (1, 1, 2, 2, 3). Which of the following tuples can be inserted into this relation without violating the FD's? (2 points) Select one: 0 (0, 1,...
Assume that R(A, B, C, D, E, F) has been decomposed into S(A, C, E, F)...
Assume that R(A, B, C, D, E, F) has been decomposed into S(A, C, E, F) and other relations. If the dependencies for R are: AB rightarrow C, C rightarrow E, E rightarrow D, D rightarrow F, F rightarrow D. (a) Find ALL non-trivial functional dependencies that hold in S (b) Determine the keys and superkeys of S (c) For each one of your functional dependencies from part a) indicate if it is a BCNF violation, a 3NF violation or...
Let R(A,B,C,D,E) be a relation with FDs F = {AB-C, CD-E, E-B, CE-A} Consider an instance...
Let R(A,B,C,D,E) be a relation with FDs F = {AB-C, CD-E, E-B, CE-A} Consider an instance of this relation that only contains the tuple (1, 1, 2, 2, 3). Which of the following tuples can be inserted into this relation without violating the FD's? (2 points) Select one: O (0, 1, 2, 4,3) (1,1,2,2,4) (1.2.2, 2, 3) o (1,1,3,2,3) All of the above can be inserted. None of the above can be inserted.
Language: SQL - Normalization and Functional Dependencies Part 4 Normalization and Functional Dependencies Consider the following relation R(A, B, C, D)and functional dependencies F that hold o...
Language: SQL - Normalization and Functional
Dependencies
Part 4 Normalization and Functional Dependencies Consider the following relation R(A, B, C, D)and functional dependencies F that hold over this relation. F=D → C, A B,A-C Question 4.1 (3 Points) Determine all candidate keys of R Question 4.2 (4 Points) Compute the attribute cover of X-(C, B) according to F Question 43 (5 Points) Compute the canonical cover of F.Show each step of the generation according to the algorithm shown in class....
Below are two relations. Each relation has a corresponding set of FDs that hold in the relation. For each relation and corresponding FDs. answer these three questions: (i) What are all the nontrivial FDs that follow from the given FDs? List each FD with a single attribute on the right side. (ii) What are the keys of the relation? (iii) What are the superkeys for the relation that are not keys? Schemas and FDs: (a) R(A, B, C, D) with...
2. (15 points) Consider a relation with schema R(A,B,C,D) and FD= { AB->C, C->D, D- >A), what are the keys of R? Hint: Consider the 15 possible non-empty subsets of attributes. First check if a set of attributes X in R is a super key of R. If X-> R then X is superkey of R. Then X is a super key and no subset of X is a super key, then X is a key - a minimum super...
Question 1: Functional Dependencies [7 marks Consider a relation R on attributes (A, B, C, D, E, F,G, H) and the following functional dependen- cies. B →G C →D DE →GC → EF DEF → H (a) What is the closure of [F, G, Hy? (b) List all of the candidate keys of R under the dependencies above. (c) List all of the FDs above that are 3NF violations (d) List all of the FDs above that are BCNF violations....
please do question 4.
Note that we follow the convention of denoting the set of attributes {A, B, C} by ABC when we write FDs but not when we write schemas. Given the following set set F of FDs on schema R= (A, B, C, D, E,G): A + BC AB + CD B +C E →D G +C EG → AD Answer the following questions. Questions 1-4 require a formal proof or disproof. A proof may be given either...
Let R(A, B, C, D, E) be a relation wit FDs F = {AB->C,
CD->E, E->B, CE->A}....
Question 4 Not yet answered Marked out of 2.00 P Flag question Let R(A,B,C,D,E) be a relation with FDs F = {AB-C, CD-E, E-B, CE-A} Consider an instance of this relation that only contains the tuple (1, 1, 2, 2, 3). Which of the following tuples can be inserted into this relation without violating the FD's? (2 points) Select one: 0 (0, 1,...
Assume that R(A, B, C, D, E, F) has been decomposed into S(A, C, E, F) and other relations. If the dependencies for R are: AB rightarrow C, C rightarrow E, E rightarrow D, D rightarrow F, F rightarrow D. (a) Find ALL non-trivial functional dependencies that hold in S (b) Determine the keys and superkeys of S (c) For each one of your functional dependencies from part a) indicate if it is a BCNF violation, a 3NF violation or...
Let R(A,B,C,D,E) be a relation with FDs F = {AB-C, CD-E, E-B, CE-A} Consider an instance of this relation that only contains the tuple (1, 1, 2, 2, 3). Which of the following tuples can be inserted into this relation without violating the FD's? (2 points) Select one: O (0, 1, 2, 4,3) (1,1,2,2,4) (1.2.2, 2, 3) o (1,1,3,2,3) All of the above can be inserted. None of the above can be inserted.
Language: SQL - Normalization and Functional
Dependencies
Part 4 Normalization and Functional Dependencies Consider the following relation R(A, B, C, D)and functional dependencies F that hold over this relation. F=D → C, A B,A-C Question 4.1 (3 Points) Determine all candidate keys of R Question 4.2 (4 Points) Compute the attribute cover of X-(C, B) according to F Question 43 (5 Points) Compute the canonical cover of F.Show each step of the generation according to the algorithm shown in class....
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