A functional dependency between two or more nonkey attributes is called a A. Bad functional B....
A functional dependency between two or more nonkey attributes is called a A. Bad functional B. Not So Bad functional C. Very Good functional D. Very Bad functional
Homework Answers
From the question:
A functional dependency between two or more nonkey attributes is called a Bad functional.
These are the transitive type relations.
These are try to eliminate in the 3 NF conversion operation.
Option a
Add Answer to:
A functional dependency between two or more nonkey attributes is
called a A. Bad functional B....
Dependency Very Good dependency (key dependency) : XA where Table Very good If all dependencies i...
Dependency Very Good dependency (key dependency) : XA where Table Very good If all dependencies in a table are '"very good", the table is in BCNF X is a candidate key Good Good dependency: X-> A where If all dependencies in a table are "very good" or "good", the table is in 3NF X is not a candidate key X is a part of a candidate key A is prime attribute Bad Bad dependency (Transitive Dependency): X A where If...
Identify, in the list below, a row in the result. Dragons B) Giants C) Lions D)...
Identify, in the list below, a row in the result. Dragons B) Giants C) Lions D) Ham Fighters 26. If all function dependencies in a table are "very good" or "bad", the table is in A) 1NF B) 2NF C) 3NF D) BCNF 27·Determine the normal form for the relation R(ABCD) and FD's: AD ? C; D A) 1NF B) 2NF C) BCNF D) 3NF -28. Which of the following is not a candidate key for R(ABCD) FD's: BD ?...
Consider a relation R with 5 attributes M, O, N, E, Y. You are given the...
Consider a relation R with 5 attributes M, O, N, E, Y. You are given the following dependencies: M-> N O -> M Y -> E NM ->Y Its candidate keys are {( O)}. 1. Which of the following is a prime attribute for the relation R? _________________ i.M ii.E ii.O iv. All attributes of the relation R are prime attributes 2. Which of the following is true about the given functional dependencies in the relation R? ______________ i.M ->...
Write the following in Java Design an enum called Rating, it has the following names: bad,...
Write the following in Java Design an enum called Rating, it has the following names: bad, okay, good, better, best Design a class called Review (reviews might be for a restaurant, movie, etc), it has two attributes: a Rating type called rating, a String type called comment. Design getters and setters for the attributes. Override the toString() method to display both the rating and the comment.
Discuss the normal forms for a relational database schema. What does functional dependency mean? Given is...
Discuss the normal forms for a relational database schema. What does functional dependency mean? Given is the relational schema R( A, B, C, D, E ) as well as the functional dependencies • AC → BDE • B → D • A → E. Convert the schema into its 3rd normal form.
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....
We have the attributes: {A, B, C, D, E, F, G}. Consider the following functional dependencies...
We have the attributes: {A, B, C, D, E, F, G}. Consider the following functional dependencies F → C, D E → B B, D, G → C G → B, D B, G → D, E F → E B, E → A, F F, G → C, D The minimal keys are: {G} Determine whether these functional dependencies are in the following normal form(s): Third Normal form or Boyce Codd normal form
We have the attributes: {A, B, C, D, E, F, G}. Consider the following functional dependencies...
We have the attributes: {A, B, C, D, E, F, G}. Consider the following functional dependencies E, F → C E → F B → A, G A, E, F → C, G D → A C, D, F → B, E, G A → B B, E → D, G Mark all functional dependencies that are implied by the dependencies above: a). D,F --> E, F b). D,F --> A,F c) D,F --> A d) D,F -->G e) D,F...
Imagine a single poorly-designed table, r(R), with attributes A, B, C, D, E, F, G, H,...
Imagine a single poorly-designed table, r(R), with attributes A, B, C, D, E, F, G, H, I, J, K, L, M. You’ve looked over the naughty designer’s work and come up with the following logical functional dependencies. A —> {B, D, F}? B —> {G, H, I}? {A, C} —> {E, J, K}? {J, K} —> {L, M} H is a composite attribute group with 3 attributes; H1, H2, H3. H3 is a multivalued attribute. L is a multivalued attribute....
Here's a relation (R), its attributes and its functional dependencies (F): R(A, B, C, D, E)...
Here's a relation (R), its attributes and its functional dependencies (F): R(A, B, C, D, E) C D → B A → D D → C E → C What is the closure of AB ({AB}+)? What is the closure of F (F+)? [ set of closures for all LHS][each LHS on one line] What is the minimal set (cover) for F? Provide a key for relation R (a minimal set of attributes that can determine all attr.) Decompose the...
Dependency Very Good dependency (key dependency) : XA where Table Very good If all dependencies in a table are '"very good", the table is in BCNF X is a candidate key Good Good dependency: X-> A where If all dependencies in a table are "very good" or "good", the table is in 3NF X is not a candidate key X is a part of a candidate key A is prime attribute Bad Bad dependency (Transitive Dependency): X A where If...
Identify, in the list below, a row in the result. Dragons B) Giants C) Lions D) Ham Fighters 26. If all function dependencies in a table are "very good" or "bad", the table is in A) 1NF B) 2NF C) 3NF D) BCNF 27·Determine the normal form for the relation R(ABCD) and FD's: AD ? C; D A) 1NF B) 2NF C) BCNF D) 3NF -28. Which of the following is not a candidate key for R(ABCD) FD's: BD ?...
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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