we have a set of attributes as R : (A, B, C, D, E, F) and functional dependencies are: AB -> C B  -> AE C  -> D

Consider the following database schema for University Library database. A student can borrow many books and a given book can be borrowed by any student if it is available in the library. For each borrowing, the borrowing and return dates are registered in the database. Student (SID: long, CPR:long (unique), Name:string, tel:number, major:String, gender:Character {'F' or 'M'}) Book (ISBN:long Title:string (unique), Author:string) BorrowedItems(stSID:long, book|SBN:long, serialNo:int (unique), BorrowingDate:date, ReturnDate:date) Write SQL statements to: 1. List ISBN, Title, Author of all books that include the word 'Database' in their titles in a descending order of ISBN. 2. List SID, Name, and Major of all female students doing major in CS'and their name starts with 'S'. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).

A candidate key is possessed by an attribute of a composite primary key. What is your reaction to the aforementioned data?

Given relation R(u, y, c, d, e, f, w) where there are two keys: {y,c} and {w}. Given a set of functional dependencies F = {fd1: {y,c} -> {u,d,e,f,w}, fd2: u -> c, fd3: w -> {u,y,c,d,e,f}}. Is R in 3NF? Explain why.

Suppose we have the table Employee[id, name, supervisor] This table implements an employee entity type and the relationship "a person has a supervisor", similar to the Company database. Even if we have referential integrity it is possible for us to have corrupt data. Consider two cases: • we could have data where an employee is their own supervisor (last row below), or • where the supervisor of A is B but B shows its supervisor to be A (first two rows belov. id supervisor A B C D name John Joyce Jim Jennifer Peter null Write an SQL statement to list any rows with the type of bad data as outlined in the above.

let R be a relation defined on the set z by aRb if a < b. What property/properties are violated? A. Symmetric & transitive B. Reflexive & Symmetric C. Reflexive & Transitive D. All three properties

Attributes from the identifying entity set's main key may be added to a weak entity set to make it strong. Please describe the overlap that will develop as a result of our choice.

find the no. of F-D's 2-attributes ? in F-closure (Ft) for a relation with

Consider the Relation R4 = (A,C,B,D,E,F), with Functional Dependencies: A -> B, C -> D, E -> D. What is the Candidate Key for R4?

Give all the keys of R if the functional dependencies on R in each of the following cases