Answer)
26) Functional dependencies are important to identify the bad and the good.
The good and bad depends on the table structure but most of the cases it is the 2NF form.
Hope this answer helps. :) Happy to help.
Identify, in the list below, a row in the result. Dragons B) Giants C) Lions D)...
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....
4. (40 points) Identify the following relations that are in Third normal form (3NF)? If it is in 3NF, is it in BCNF? You must explain your answer to receive points. Also, for each question, pick one FD not in BCNF and decompose R into tables if it is not in BCNF (1) R(ABCD) FD's: ACD B;AC D D C;ACB (2) R(ABCD) FD's: AB C; ABD C;ABC D;ACD (3) R(ABCD) FD's: AB; B A;A D D B (4) R(ABCD) FD's:...
4. (40 points) Identify the following relations that are in Third normal form (3NF)? If it is in 3NF, is it in BCNF? You must explain your answer to receive points. Also, for each question, pick one FD not in BCNF and decompose R into tables if it is not in BCNF. (2) R(ABCD) FD's: AB-»C; ABD->C; ABC-> D; AC-ID (4) R(ABCD) FD's: C- B;A->B; CD -»A; BCD (5) R(ABCD) FD's: AD C;D-A;A-C;ABC A D, 4. (40 points) Identify the...
MySQL: Consider the following abstract relational schema: (A, B, C, D, E, F) Now assume the following functional dependencies: A -> B, C, D, E, F C -> B Note: This implies that A is a key. Is this database in 1NF, 2NF, 3NF, or BCNF? Why?
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....
Given the following relation schemas and the sets of FD's: a- R(A,B,C,D) F={ABẠC,C7D, D´A, BC+C} b- R(A,B,C,D) F={BẠC, BD, AD>B} C- R(A,B,C,D) F={AB-C, DC+D, CD+A, AD+B} d- R(A,B,C,D) F={AB=C, C+D, D™B, DE} e- R(A, B, C, D, E) F= {AB+C, DB+E, AE>B, CD+A, ECD} In each case, (i) Give all candidate keys (ii) Indicate the BCNF violation Give the minimal cover and decompose R into a collection of relations that are BCNF. Is it lossless? Does it preserve the dependencies?...
Consider a relation R(A,B,C,D,E) with the following functional dependencies: 8. AB C BCD CDE DEA (a) Specify all candidate keys for R. (b) Which of the given functional dependencies are Boyce-Codd Normal Form (BCNF) violations'? (c) Give a decomposition of R into BCNF based on the given functional dependencies. (d) Give a different decomposition of R into BCNF based on the given functional dependencies. (e) Give a decomposition of R into 3NF based on the given functional dependencies. Consider a...
Consider a relation R(A,B,C,D,E) with the following functional dependencies: 8. AB C BCD CDE DEA (a) Specify all candidate keys for R. (b) Which of the given functional dependencies are Boyce-Codd Normal Form (BCNF) violations'? (c) Give a decomposition of R into BCNF based on the given functional dependencies. (d) Give a different decomposition of R into BCNF based on the given functional dependencies. (e) Give a decomposition of R into 3NF based on the given functional dependencies.
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...
Write the complete proof. Consider the relational schemas given below and the respective sets of functional dependencies valid in the schemas For each one of the relational schemas, determine the highest normal form, which is valid for a schema. Justify your answer If a schema is not in BCNF, then decompose it into a minimum number of schemas so that each one of them is in BCNF. Justify your answers. Justification must include the derivations of minimal keys from the...