Consider the relations Courses1, Courses2, Enrollment and Students. Courses cid cname Location Al Calculus LI A2 Algebra L2 A5 English L3 Student(sid, sname, age, level) Courses2 cid name A5 English Bl History B2 Classroom L3 L4 Computing LS b) Courses 1-Courses2 Enrollment cid sid 101 Al (1) Give the results of the following relational algebra expressions: a) Teid ( name="History' OR 'Computing (Courses2)) Courses 1 Courses2 102 A5 103 BI 102 Al 102 A2
Consider the relations Courses1, Courses2, Enrollment and Students. Courses cid cname Location Al Calculus LI A2 Algebra L2 A5 English L3 Student(sid, sname, age, level) Courses2 cid name A5 English Bl History B2 Classroom L3 L4 Computing LS b) Courses 1-Courses2 Enrollment cid sid 101 Al (1) Give the results of the following relational algebra expressions: a) Teid ( name="History' OR 'Computing (Courses2)) Courses 1 Courses2 102 A5 103 BI 102 Al 102 A2
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
Related questions
Question
![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).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa1514e68-2941-4861-b30b-0ef64874df06%2Fdd6b06d7-c380-47ac-b5ef-15d6dcea64bb%2Fbwwglaq_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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).
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