Consider the relations Courses1, Courses2,_Enrollmentand Students.Courses1Locationcid enameAl CalculusLIA2 Algebra L2A5 EnglishL3Student(sid, sname, age, level)Courses2cidA5BIB2nameEnglishHistoryb) Courses 1-Courses2L3L4Computing L5c) Courses Courses2Classroomd) Courses1 Enrollment(1) Give the results of the following relationalalgebra expressions:a) Teid ( name='History' OR 'Computing (Courses2))e) Enrollment / Teid (Courses1)EnrollmentcidAlA5sid101102103102102B1AlA2(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 incourse Calculus._c) Find the names of students who have enrolled atleast 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 allcourses (both Courses1 and Courses2).

Consider the relations Courses1, Courses2, Enrollment and Students. Courses cid ename Location Al Calculus LI A2 Algebra L2 A5 English L3 Student(sid, sname, age, level) Courses2 cid A5 BI B2 Classroom L3 L4 Computing L5 b) Courses 1-Courses2 name English History (1) Give the results of the following relational algebra expressions: a) Teid ( name='History' OR 'Computing (Courses2)) c) Courses Courses2 Enrollment sid cid 101 Al 102 A5 103 В1 102 Al 102 A2 d) Courses1 MEnrollment

Consider the relations Courses1, Courses2, Enrollment and Students. Courses cid ename Location Al Calculus LI A2 Algebra L2 A5 English L3 Student(sid, sname, age, level) Courses2 cid A5 BI B2 Classroom L3 L4 Computing L5 b) Courses 1-Courses2 name English History (1) Give the results of the following relational algebra expressions: a) Teid ( name='History' OR 'Computing (Courses2)) c) Courses Courses2 Enrollment sid cid 101 Al 102 A5 103 В1 102 Al 102 A2 d) Courses1 MEnrollment

Principles of Information Systems (MindTap Course List)

12th Edition

ISBN:9781285867168

Author:Ralph Stair, George Reynolds

Publisher:Ralph Stair, George Reynolds

Chapter5: Database Systems And Applications

Section: Chapter Questions

Problem 4PSE: Using a graphics program, develop an entity-relationship diagram for a database application for an...

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Consider the relations Courses1, Courses2, _Enrollment and Students. Coursesl cid ename Al Calculus Location L1 A2 Algebra L2 A5 English L3 Student(sid, sname, age, level) Courses2 cid A5 B1 B2 b) Courses 1-Courses2 name English L3 History L4 Computing L5 (1) Give the results of the following relational algebra expressions: a) Teid ( name="History' OR 'Computing (Courses2)) c) Courses Courses2 Classroom d) Courses1 Enrollment e) Enrollment / Teid (Courses1) Enrollment sid cid 101 Al 102 A5 103 Bl 102 Al 102 A2 (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).
The multiple choice answers are: - One and only one - one or many - zero or one - zero or many.
I need help with the following Consider a STUDENT relation in a UNIVERSITY database with the followingattributes (Name, Ssn, Local_phone, Address, Cell_phone, Age, Gpa). Note thatthe cell phone may be from a different city and state (or province) from thelocal phone. A possible tuple of the relation is shown below:Name Ssn Local_phone Address Cell_phone Age GpaGeorge Shaw 123-45-6789 555-1234 123 Main St., 555-4321 19 3.75William Edwards Anytown, CA 94539a. Identify the critical missing information from the Local_phone andCell_phone attributes. (Hint: How do you call someone who lives in a dif ferent state or province?)b. Would you store this additional information in the Local_phone andCell_phone attributes or add new attributes to the schema for STUDENT?c. Consider the Name attribute. What are the advantages and disadvantagesof splitting this field from one attribute into three attributes (first name,middle name, and last name)?d. What general guideline would you recommend for…
For each of the following pairs of expressions, give instances of relations thatshow the expressions are not equivalent. ΠA(r − s) and ΠA(r) − ΠA(s).
The database interface of a library allows searching only for a single attribute (such as Title or Author ) in each query. Your friend decided to extend it’s functionality and wrote an algorithm that allows searching for books that satisfy multiple predicates over single attributes in conjunction. He tells you the algorithm reuses the already implemented query functionality and works by intersecting the results ( book id’s ) of queries over single attributes.Which of the following assumptions on your friend’s algorithm are plausible?a) Its worst-case run-time necessarily increases exponentially with respect to the number of attributes in the query.b) Its worst-case run-time depends on the length of the longest result of the single-attribute queries.c) It might be implemented using an join.d) It might be implemented using sorting.
11 of 40 Consider the following Relation instance of Students: ID firstNamelastName GPA Address 123 Albertson Albertson 3.5 888 CDN 234 Mary Albertson 4.2 759 St. Catherine Est. 345 Smith Smith 2.9 105 Queen Mary 456 Theodore McDonald 3.7 208 Jean Talon West 567 Jean Mary 3.9 950 Des Laurentides 678 Junior Junior 4.1 326 St. Martin West How many records will be in the result of the following SQL Query? Select ID, firstName From Students S Where firstName = lastName and firstName NOT IN ( Select lastName From Students Where ID S.ID); Answer:
Change the Class Diagram to have (Generalization, Aggregation, Composition, Association and multiplicity) relations.
Consider a database that includes four relations Student, Staff, Program, Advisor Student BannerID FName LName PCode 8003778543 James Oloye PO01 8765990453 Paul Carter P002 8002786543 Anita Boris PO01 8307563321 Jane Eyre P001 Staff BannerID FName LName PCode 8014768954 Chimamanda Adichie PO02 8001876565 Paulette Davis P001 Program PCode PName PO01 Library Science PO02 Management and Information Science
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).
Suppose RR is a relation with attributes A1,A2,…,AnA1,A2,…,An. How many superkeys will RR have if a) The only candidate key is A1A1. b) The only candidate keys are A1A2A1A2 and A1A3A1A3.
Consider the relations Courses1, Courses2, _Enrollment and Students. Courses cid cname Al Calculus A2 Algebra A5 English Location LI L2 L3 Student(sid, sname, age, level) Courses2 cid A5 Bl B2 name English History b) Courses 1-Courses2 L3 L4 Computing L5 (1) Give the results of the following relational algebra expressions: a) Teid ( name="History' OR 'Computing (Courses2)) c) Courses Courses2 Classroom d) Courses1 Enrollment e) Enrollment / Teid (Courses1) Enrollment sid cid 101 Al 102 A5 103 B1 102 102 Al A2 (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).
The following digraph represents a relation R. a C b d List the ordered pairs in the relation. R = { }.