Write functional dependencies for the following relational schema:
account (account_number, customer_name, branch_name, branch_city, assets)
account_number -> customer_name
branch_name -> branch_city
account_number -> assets
Write functional dependencies for the following relational schema: account (account_number, customer_name, branch_name, branch_city, assets)
1. Given the following BANKING database, formulate a Relational Algebra expression for each of the following questions. SELECT should be performed before any JOIN operation. Notation: use the symbol S for SELECT, P for PROJECT, J for INNER JOIN, * for NATURAL JOIN, LJ for LEFT JOIN, RJ for RIGHT JOIN, R for RENAME, and F for FUNCTION. Please type your answer; hand-writing is not accepted. branch(branch_name, branch_city, assets) customer (customer_name, customer_street, customer_city) loan (loan_number, branch_name, amount) borrower (customer_name, loan_number)...
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...
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.
Q3: Given a relational schema ? = {?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?} and a set of functional dependencies ? = {? → ? ? ? ?, ? → ? ? ?, ? → ?, ? ? → ?} and a key(R) = AI 1. Is R in BCNF? If yes, justify your answer. 2. If no, explain why and decompose R for two levels only. 3. Check whether the decomposition in step 2 dependency...
Q2: Explain with example the difference between super keys and functional dependencies in relational databases. Show how to find a key (super/candidate) for the following functional dependencies: ? = {?,?,?,?,?,?,?,?,?,?,?,?,?} ? = {?→????,?→???,?→?,??→?,??→?}
Q3: Given a relational schema R = {A,B,C,D,E,F,G,H,1,J,K} and a set of functional dependencies F {A B C D E, E F G H I J,AI →K} and a key(R) = AI = 1. Is R in BCNF? If yes, justify your answer [5 points] 2. If no, explain why and decompose R for two levels only [10 points] 3. Check whether the decomposition in step 2 dependency preserved or not [5 points]
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?
Given a schema R (A, B, C, D, E, F)and a set Fof 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 ?+
consider the schema R-(A,B.C,D,E) and the following set F of functional dependencies holds on R ABC CD-E B- D E-A Problem 2. Suppose that we decompose the relation schema R into R, -(A, B, C) and R, (C, D,E). Show that this decomposition is not a lossless-join decomposition.
Consider the following schema and functional dependencies: SHIPPING (ShipName, ShipType, VoyageID, Cargo, Port, ArrivalDate) Key: ShipName, ArrivalDate FD1: ShipName > ShipType FD2: VoyageID > ShipName, Cargo FD3: ShipName, ArrivalDate > VoyageId, Port 1.Please list the final set of 3NF schema including all its keys. 2.Do any of the finalized 3NF schema have determinates that are not candidate keys? If yes, explain - which schema(s)? Why?