Dependency Very Good dependency (key dependency) : XA where Table Very good If all dependencies i...
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....
for the relation R(O,P,X,Y,E, S) FDs={ O->P, XY->O, OE->S, EY->X, PY->X}. 1.Classify each functional dependency 2. Decompose the relation into BCNF relation. 3. Determine whether each of the decompositions has the lossless join property with respect to F and conclude for the whole decomposition. 4. Determine whether each of the decompositions has the dependency preserving property with respect to FD and conclude for the whole decomposition
DBMS class funcbonal U in & set tion of the principle of closure ot of tunca te key(s) of a relation schen a set of functional superkey n attribute at a time from K unt K ence rules for of an attribute uses a It is possible to progressively dencies through the systematic ond method for identitying the candida l dependencies that prevai hat of decomposition. In this method. given Universal Relation Schema (URS), the superkey, K, consisting of a...
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...
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 ?...
The employee is table, the best candidate for primary key is Select one: a. Department ID b. Employee hiredate c. Employee ID d. Employee salary Question 2 A primary key can be composed of more than one attribute. Select one: True False Question 3 A foreign key allows you to join two tables. Select one: True False Question 4 Given two tables, department (dept_id, dept_location, dept_name) and EMPLOYEE(emp_id, emp_name, emp_dept_id, emp_name, emp_salary), which attribute (column) is the foreign key? Select...
Relational Database Design Theory, please answers ALL parts because they are related to each other, and I can't separate it into different questions. Please help! By looking at the PHLogger table: A. List all non-trivial functional dependencies. B. What is the highest normal form the PHLogger table is in currently? C. The external consulting experts at DBInstructor, Inc., have noticed that city and state of an address can be inferred by its postal code (zip code). What new functional dependencies...
ChangeRequest(CRID, CRType, CRTitle, CROriginDate, CRPriority, CRNeedEvent, CRStatus) NeedByEvent(Event) CRPrevState(CRID, CRState, StartDate, EndDate) CRAssigned(CRID, EmpID, StartDate, EndDate) Employees(EmpID, FirstName, LastName, JobTitle) ChangeRequest(CRID, CRType, CRTitle, CROriginDate, CRPriority, CRNeedEvent, CRStatus) The CRID is the primary key, it is unique, and it is an positive integer The CRType may be one of two values: "Deficiency" or "Enhancement" CRTitle is a variable length string that may be up to 2048 characters CROriginDate is a date CRPriority is an integer that may assume a value of...
Problem 1 The following table summarizes the results for all values of d. for a converging lens Case Type Direction Magnification S< do < 26 Real Inverted Enlarged d -2/ Real Inverted Same size de > 27 Real Inverted Reduced d. Virtual Upright Enlarged Sketch and find the image for each case shown in the table by changing the objects position Problem 2 0.25 p 0.23 P AI (b) Graded index (GRIN) rod lens is a glass rod whose refractive...
will work with up to 3 partners (similar to a lab group) to prepare a written report which analyzes kinetic data that has been provided to you. All student groups will receive data for the hypothetical reaction aAlE) products where a is a numeric variable and A is a chemical variable. The reaction therefore has the form of a decomposition reaction, in which a single substance forms one or more new substances. For consistency, all concentrations start out at 1.000...