Consider the relational schema for a library system as given below: Member (mem _no, name, dob) Books (isbn, title, authors, publisher) Borrowed (mem_no, isbn, date) Write the following queries in relational algebra. i. List the members who have not borrowed any books from the library. ii. Name all the books borrowed by a member named 'Ram'. ii. List the book that has been borrowed the most.

Consider the relational schema for a library system as given below: Member (mem _no, name, dob) Books (isbn, title, authors, publisher) Borrowed (mem_no, isbn, date) Write the following queries in relational algebra. i. List the members who have not borrowed any books from the library. ii. Name all the books borrowed by a member named 'Ram'. ii. List the book that has been borrowed the most.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Consider the relations Courses1, Courses2, _Enrollment and Students. Courses cid ename Al Calculus A2 Algebra A5 English Location LI L2 L3 Student(sid, sname, age, level) Courses2 cid AS B1 B2 name English History b) Courses 1-Courses2 L3 L4 Computing L5 c) Courses Courses2 Classroom (1) Give the results of the following relational _algebra expressions: a) Teid ( name='History' OR 'Computing (Courses2)) d) Courses1 Enrollment e) Enrollment / Teid (Courses1) Enrollment sid cid 101 Al 102 A5 103 Bl 102 Al 102 A2 CARENA (2) Write the following query in Relational Algebra. a) Find the sids of students who have enrolled in course Calculus. b) Find the names of students who have enrolled in course Calculus. _c) Find the names of students who have enrolled at least one course. _d) Find the names of students who have enrolled in _Calculus or Algebra. e) Find the sids of students who have enrolled in all courses (both Courses1 and Courses2).
a) Complete the object conceptual data model for the following relational schema. Branch BranchID Location B001 Shatin ВО02 Homantin Order OrderID SalesTotal BranchID 0001 100 BO01 0002 200 BO02 0003 300 BO01 BranchID is the primary key of Branch table. OrderID is the primary key of Order table. BranchID in Order table is the foreign key references Branch table. Now, assume the OIDS are given below: Branch BranchID Location OID B001 Shatin OID1 B002 Homantin OID2 Order OrderID SalesTotal BranchID OID 0001 100 ВО01 OID3 0002 200 ВО02 OID4 0003 300 ВО01 OID5
Question 20 Please fill in the blank correctly.
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15. Circle all areas that break the referential integrity constraint. (8 Points) Not a Relational Table EmpID EmpInfo EmpInfo EmpPhone 0001 Joe 0002 Sue 0001 Joe 0004 Pat 0005 Mike M FMF M x234 x345 x234 x567, x789 x678 EmpBdate 1/11/1985 2/7/1983 1/11/1985 3/8/1971 a long time ago
1) Find names of those departments, each of which has at least two same-aged employees. 2)List names of those departments each of which has an employee named ‘Joe’. 3)List the names of employees, each of whom has salary more than the budget of the department he/she works in. Answer the above questions in relational algebra with reference to the following relational schema. Key fields are bold. Emp (eid:integer, ename:string, age:integer, salary:real)Works (eid:integer, did:integer, pct_time:integer)Dept (did:integer, dname:string, budget:real)
CSC 472 Introduction to Database Systems Project Consider the contents of output tuples generated by a join operator. The advantage of "late materialization" approach is that future operators in the query plan never need to go back to the base tables to get more data. Group of answer choices True False
subject : database system Member (MemberID, Name, ContactNo, Status, Sex)Borrow (BorrowNo, MemberID, CatalogNo, CheckOut, Return, Fine)Book (CatalogNo, Title, Author, Publisher, Year, Category) Write the appropriate relational algebra to produce the following queries. List member ID for members that borrowed all the ‘database’ books (category).
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Q2/ Map your ER into a relational schema. All constraints must be included: Primary keys (PK) highlighted, foreign keys (FK) well referring to their PK, unique not null and other constraints also specified. Name PUBLISHER Phone Address publish Author_id Book_id M BOOK AUTHOR Has Titele M Name Date_out Loan Due_date phone f name I name BORROWER address Card id F_name
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Relation algebra (Database)