Consider the relation R= {A, B, C, D, E, F, G, H} and the set of...

Consider the relation R= {A, B, C, D, E, F, G, H} and the set of functional dependencies: FD= {{B}—> {A}, {G}—> {D, H}, {C, H}—> {E}, {B, D}—> {F}, {D}—>{C}, {C}—> {G}} 1) Draw FD using the diagrammatic notation. 2) What are all candidate keys for R? 3) If delete {C}—>{G} and change {C, H}—> {E} to {C, H}—> {E, G}, what are all candidate keys for R

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orchestra answered 3 years ago

Consider the following relation R(A, B, C, D, E, G) and the set of functional dependencies...

Consider the following relation R(A, B, C, D, E, G) and the set of functional dependencies F={ A → BCD, BC → DE, B→D, D → A} Note: Show the steps for each answer. (a) Compute B+ . (b) Prove (using Armstrong’s axioms) that AG is superkey. (c) Compute Fc. (d) Give a 3NF decomposition of the given schema based on a canonical cover. (e) Give a BCNF decomposition of the given schema based on F. Use the first functional...

Relational Modelling (20 marks) For the relation: R (A, B, C, D, E, F, G) The...

Relational Modelling For the relation: R (A, B, C, D, E, F, G) The following functional dependencies hold: F -> D G -> B C -> D F -> C, E B -> F A -> F, G 2.1 Use Inference rules to find the minimal b asis. 2.2 Determine the primary key of the relation. 2.3 Based on this key, determine if the relation R is in BCNF. Explain your answer in terms of the FDs and the key....

How many proper subsets are there for this set {A,B,C,D,E,F,G,H,I}?

Q1. a. Given a schema R (A, B, C, D, E, F) and a set F...

Q1. a. Given a schema R (A, B, C, D, E, F) and a set F of functional dependencies {A → B, A → D, CD → E, CD → F, C → F, C → E, BD → E}, find the closure of the set of functional dependencies ?+ b. Given a schema R = CSJDPQV and a set FDs of functional dependencies FDs = {C → CSJDPQV, SD → P, JP → C, J → S} 1. Find...

Consider the following relational schema and set of functional dependencies. S(A,B,C,D,E,F,G) D → E E →...

Consider the following relational schema and set of functional dependencies. S(A,B,C,D,E,F,G) D → E E → B C → FG BE → AC Is the decomposition of S into S1(E,G,F) and S2(A,B,C,D,G) a lossless join decomposition? Choose one of the following queries as your answer: SELECT ’lossy’; SELECT ’lossless’;

1. ¬B∨(G↔J), H→(B&C) ∴(H&J)→G 2. A∨B, C↔¬(B∨D) ∴C→A 3. (A&B) ↔ (F→G), (A&F) & B∴(G→R)→R 4....

1. ¬B∨(G↔J), H→(B&C) ∴(H&J)→G 2. A∨B, C↔¬(B∨D) ∴C→A 3. (A&B) ↔ (F→G), (A&F) & B∴(G→R)→R 4. T→¬B, T→¬D ∴ T→¬(B∨D) 5. ¬(M∨¬S), S→(R→M) ∴A → (¬R∨T) 6. (F&G) → I, (I∨J) → K ∴F→(G→K) 7. ¬U, O→G, ¬(O∨G) →U ∴G Prove that the arguments are valid by constructing a dedication using the rules MP, MT, DN, Conj, Simp, CS, Disj, DS, DM, CP, HS, BE, and DL. Use CP if needed.

Consider the following bivariate data. Point A B C D E F G H I J...

Consider the following bivariate data. Point A B C D E F G H I J x 0 1 1 2 3 4 5 6 6 7 y 5 5 6 5 4 3 2 0 1 1 (a) Construct a scatter diagram of the given bivariate data. (Do this on paper. Your instructor may ask you to turn in this work.) (b) Calculate the covariance. (Give your answer correct to two decimal places.) (c) Calculate sx and sy. (Give...

Consider the following demand curve: A B C D E F G H I J P...

Consider the following demand curve: A B C D E F G H I J P $0.50 $0.45 $0.40 $0.35 $0.30 $0.25 $0.20 $0.15 $0.10 $0.05 QD 1 2 4 6 9 12 16 20 25 30 Calculate elasticities for pairs of points to check statements that were made during class and in the text. When making the calculations, use average price and average quantity for the two points. The formula for this should be in your notes. It is...

Please fill in the blanks (values of A, B, C, D, E, F, G, H, I...

Please fill in the blanks (values of A, B, C, D, E, F, G, H, I , J) for the following financial statements. The firm’s tax rate is 35.3%. Income Statement for Fiscal Year 2015 Sales 2,000 Cost of goods sold 1,500 Gross margin 500 Selling and general expenses 300 Operating income 200 Interest income 5 205 Interest expense 21 Restructuring charges 14 Income before tax 170 Income tax 60 Net income J Balance Sheet, Year 2014 and Year 2015...

For the relation R(A,B,C,D,E) with the following Functional Dependencies: A → B, A → C, BC...

For the relation R(A,B,C,D,E) with the following Functional Dependencies: A → B, A → C, BC → D, AC → E, CE → A, list all non-trivial FDs following from the above. Generate all possible keys for R. Check whether R is in 3NF. If it is in 3NF, explain the criteria you used. If it is not in 3NF, convert it into 3NF, showing the new relations and their FDs.

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