The Gateway to Computer Science Excellence
For all GATE CSE Questions
Toggle navigation
Facebook Login
or
Email or Username
Password
Remember
Login
Register

I forgot my password
Activity
Questions
Unanswered
Tags
Subjects
Users
Ask
Prev
Blogs
New Blog
Exams
Recent questions tagged relationalalgebra
+2
votes
2
answers
1
UGCNETJune2019II33
With respect to relational algebra, which of the following operations are included from mathematical set theory? Join Intersection Cartisian product Project a and d b and c c and d b and d
asked
Jul 2, 2019
in
Databases
by
Arjun
Veteran
(
430k
points)

240
views
ugcnetjune2019ii
relationalalgebra
+1
vote
1
answer
2
MADE EASY Relational Algebra
In a relational algebra ∩ is not a basic operator, to make it basic only relational operator we should have are X, – X, U U, –
asked
May 25, 2019
in
Databases
by
Hirak
Active
(
3.6k
points)

203
views
databases
relationalalgebra
0
votes
0
answers
3
ISI2018PCBCS10
Consider two $n \times 1$ vectors $u$ and $v$ , stored as table $U(\text{ind,val})$ and $V(\text{ind,val})$ with the same schema A row $(i,u_i)$ of table $U$ specifies the $i^{th}$ element of vector $u$ has value $u_i$ ... $u + v$ of the two vectors $u$ and $v$. Explain your solution.
asked
May 12, 2019
in
Databases
by
akash.dinkar12
Boss
(
42.4k
points)

87
views
isi2018pcbcs
databases
relationalalgebra
sql
descriptive
0
votes
0
answers
4
Made Easy Test Series:Relational Algebra
... this implication holds true?? Selection operation is commutative. But is two project operation can be merge in one project operation? Can project operation removes duplicates too??
asked
May 9, 2019
in
Databases
by
srestha
Veteran
(
118k
points)

122
views
databases
relationalalgebra
madeeasytestseries
0
votes
0
answers
5
Raghuramkrishnan Exercise4.3 question 11 page no127 Relational Algebra
Suppliers(sid, sname, address) Parts(pid, pname, color) Catalog(sid, pid, cost) Find the pids of the most expensive parts supplied by suppliers named Yosemite Sham
asked
May 8, 2019
in
Databases
by
aditi19
Active
(
5.2k
points)

77
views
databases
relations
relationalalgebra
relationalcalculus
joins
0
votes
0
answers
6
Raghuramkrishnan Exercise4.3 page127
Given relation catalog(sid, pid, cost) Find pairs of sids such that the supplier with the first sid charges more for some part than the supplier with the second sid what is the relational algebra expression for this?
asked
May 7, 2019
in
Databases
by
aditi19
Active
(
5.2k
points)

57
views
databases
relationalcalculus
relations
relationalalgebra
joins
0
votes
0
answers
7
Self Doubt on SQL AND operator
Here why does the 5th query select * from employees natural join works_on where PID = 'X' AND PID='Y'; is not working The queries are The output are
asked
Apr 30, 2019
in
Databases
by
kd.....
Junior
(
853
points)

95
views
sql
databases
relationalalgebra
+1
vote
3
answers
8
Raghuramkrishnan Exercise 4.1 Relational Algebra
Given two relations R1 and R2, where R1 contains N1 tuples, R2 contains N2 tuples, and N2>N1> 0, give the minimum and maximum possible sizes (in tuples) for the result relation produced by each of the following relational algebra expressions. In each ... $σa=5(R1)$ (selection) $\pi a(R1)$ (projection) $R1/R2$ (division)
asked
Apr 11, 2019
in
Databases
by
aditi19
Active
(
5.2k
points)

328
views
databases
relationalalgebra
relationalcalculus
relations
0
votes
0
answers
9
ISI2017PCBCS3b
Consider the following relations: $\text{STD_CHOICES } (\underline{\text{Student_ID}}, \underline{\text{Course_ID}}, \text{Semester})$ and $\text{COURSE_ASSIGN} (\underline{\text{Teacher_ID}}, \underline{\text{Course_ID}}, \underline{\text{Semester}})$. The ... the ID for all the students who have not been taught by the same teacher in more than one course across all semesters.
asked
Apr 8, 2019
in
Databases
by
akash.dinkar12
Boss
(
42.4k
points)

61
views
isi2017pcbcs
databases
relationalalgebra
relationalcalculus
descriptive
0
votes
0
answers
10
Self Doubt
We know that Relational Algebra is $Procedural$ whereas TRC and DRC are $NonProcedural$ querry languages. But what exactly differentiates them? Please explain using some example. In Relational Algebra we give what to retrieve ... https://stackoverflow.com/questions/32837278/differencebetweenrelationalalgebraandrelationalcalculus/32841232#32841232 Please explain using some example
asked
Mar 30, 2019
in
Databases
by
!KARAN
Active
(
2.4k
points)

34
views
relationalalgebra
tuplerelationalcalculus
0
votes
0
answers
11
DBMS Korth Edition 6 Exercise 6 Question 18 (Page No. 254)
Let R = (A, B) and S = (A, C), and let r (R) and s(S) be relations. Using the special constant null, write tuplerelationalcalculus expressions equivalent to each of the following: a. r $ROJ$ s b. r $FOJ$ s c. r $LOJ$ s
asked
Mar 27, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

47
views
databases
relationalmodel
relationalalgebra
relationalcalculus
0
votes
2
answers
12
Dbms, relational algebra.
Consider two relations R1 , R2 with N1 and N2 tuples where N2 > N1 > 0, what are the minimum and maximum rows for the RA expression R2/R1 ?
asked
Mar 27, 2019
in
Databases
by
Priyansh Singh
Junior
(
599
points)

83
views
acetestseries
databases
relationalalgebra
0
votes
0
answers
13
DBMS Korth Edition 6 Exercise 6 Question 16 (Page No. 254)
Let R = (A, B) and S = (A, C), and let r (R) and s(S) be relations. Write relationalalgebra expressions equivalent to the following domainrelational calculus expressions: a. {< a >  ∃ b (< a, b > ∈ r ∧ b = 17)} b. {< a, b, c >  ... < a, c > ∈ s ∧ ∃ b1, b2 (< a, b1 > ∈ r ∧ < c, b2 > ∈ r ∧ b1 > b2))}
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

44
views
databases
relationalmodel
relationalcalculus
relationalalgebra
0
votes
0
answers
14
DBMS Korth Edition 6 Exercise 6 Question 15 (Page No. 253254)
Consider the employee database shown here. Give expressions in tuple relational calculus and domain relational calculus for each of the following queries: a. Find the names of all employees who work for First Bank Corporation . b ... (person name, company name, salary) company (company name, city) manages (person name, manager name)
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

67
views
databases
relationalmodel
relationalalgebra
relationalcalculus
tuplerelationalcalculus
0
votes
0
answers
15
DBMS Korth Edition 6 Exercise 6 Question 14 (Page No. 253)
Consider the following relational schema for a library: member(memb_no, name, dob) books(isbn, title, authors, publisher) borrowed(memb_no, isbn, date) Write the following queries in relational algebra. a. Find the names of members ... if a member does not borrow any books, then that member does not appear in the borrowed relation at all.
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

74
views
databases
relationalmodel
relationalalgebra
0
votes
0
answers
16
DBMS Korth Edition 6 Exercise 6 Question 13 (Page No. 253)
Consider the relational database shown here. Give a relationalalgebra expression for each of the following queries: a. Find the company with the most employees. b. Find the company with the smallest payroll. c. Find those ... works (person name, company name, salary) company (company name, city) manages (person name, manager name)
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

54
views
databases
relationalalgebra
relationalmodel
0
votes
0
answers
17
DBMS Korth Edition 6 Exercise 6 Question 12 (Page No. 253)
Using the university example, write relationalalgebra queries to find the course sections taught by more than one instructor in the following ways: a. Using an aggregate function. b. Without using any aggregate functions.
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

38
views
databases
relationalmodel
relationalalgebra
0
votes
0
answers
18
DBMS Korth Edition 6 Exercise 6 Question 11 (Page No. 252)
Consider the relational database shown here, where the primary keys are underlined. Give an expression in the relational algebra to express each of the following queries: a. Find the names of all employees who work for First Bank ... works (person name, company name, salary) company (company name, city) manages (person name, manager name)
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

159
views
databases
relationalmodel
relationalalgebra
0
votes
0
answers
19
DBMS Korth Edition 6 Exercise 6 Question 10 (Page No. 252)
Write the following queries in relational algebra, using the university schema. a. Find the names of all students who have taken at least one Comp. Sci. course. b. Find the IDs and names of all students who have ... instructor. d. Find the lowest, across all departments, of the perdepartment maximum salary computed by the preceding query.
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

41
views
databases
relationalmodel
relationalalgebra
0
votes
0
answers
20
DBMS Korth Edition 6 Exercise 6 Question 9 (Page No. 252)
Describe how to translate join expressions in SQL to relational algebra.
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

29
views
databases
relationalmodel
relationalalgebra
sql
0
votes
0
answers
21
DBMS Korth Edition 6 Exercise 6 Question 8 (Page No. 251)
Consider the relational database given below where the primary keys are underlined. Give an expression in tuple relational calculus for each of the following queries: a. Find all employees who work directly for Jones. b. Find all ... works (person name, company name, salary) company (company name, city) manages (person name, manager name)
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

54
views
databases
relationalmodel
relationalalgebra
relationalcalculus
tuplerelationalcalculus
0
votes
0
answers
22
DBMS Korth Edition 6 Exercise 6 Question 7 (Page No. 251)
Let R = (A, B) and S = (A,C), and let r (R) and s(S) be relations.Write expressions in relational algebra for each of the following queries: a. {< a >  ∃ b (< a, b > ∈ r ∧ b = 7)} b. {< a, b, c >  < a, b > ∈ r ∧ < ...  ∃ c (< a, c > ∈ s ∧ ∃ b1, b2 (< a, b1 > ∈ r ∧ < c, b2 > ∈ r ∧ b1 > b2))}
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

18
views
databases
relationalmodel
relationalalgebra
relationalcalculus
0
votes
0
answers
23
DBMS Korth Edition 6 Exercise 6 Question 5 (Page No. 251)
Let the following relation schemas be given: R = (A, B,C) S = (D, E, F) Let relations r(R) and s(S) be given. Give an expression in the tuple relational calculus that is equivalent to each of the following: a. $\prod _A(r)$ b. $\sigma _{B =17} (r )$ c. r × s d. $\prod _{A,F} (\sigma _{C = D}(r × s))$
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

10
views
databases
relationalmodel
relationalalgebra
0
votes
0
answers
24
DBMS Korth Edition 6 Exercise 6 Question 4 (Page No. 250)
(Division operation): The division operator of relational algebra, , is defined as follows. Let r (R) and s(S) be relations, and let S ⊆ R; that is, every attribute of schema S is also in schema R. ... using division. (By doing so, you would have shown how to define the division operation using the other relational algebra operations.)
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

13
views
databases
relationalmodel
relationalalgebra
0
votes
0
answers
25
DBMS Korth Edition 6 Exercise 6 Question 3 (Page No. 250)
The natural outerjoin operations extend the naturaljoin operation so that tuples from the participating relations are not lost in the result of the join. Describe how the thetajoin operation can be extended so that tuples from the left, right, or both relations are not lost from the result of a theta join.
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

26
views
databases
relationalalgebra
relationalmodel
0
votes
0
answers
26
DBMS Korth Edition 6 Exercise 6 Question 2 (Page No. 250)
Consider the relational database given below, where the primary keys are underlined. Give an expression in the relational algebra to express each of the following queries: a. Find the names of all employees who live in the same ... works (person name, company name, salary) company (company name, city) manages (person name, manager name)
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

35
views
databases
relationalmodel
relationalalgebra
0
votes
0
answers
27
DBMS Korth Edition 6 Exercise 6 Question 1 (Page No. 249)
Write the following queries in relational algebra, using the university schema. a. Find the titles of courses in the Comp. Sci. department that have 3 credits. b. Find the IDs of all students who were taught by an ... enrollment, across all sections, in Autumn 2009. g. Find the sections that had the maximum enrollment in Autumn 2009.
asked
Mar 26, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

30
views
databases
relationalmodel
relationalalgebra
0
votes
2
answers
28
DBMS Korth Edition 6 Exercise 2 Question 13 (Page No. 55)
Consider the bank database. Give an expression in the relational algebra for each of the following queries: a. Find all loan numbers with a loan value greater than ... borrower (customer name, loan number) account (account number, branch name, balance) depositor (customer name, account number)
asked
Mar 25, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

76
views
databases
relationalmodel
relationalalgebra
0
votes
0
answers
29
DBMS Korth Edition 6 Exercise 2 Question 12 (Page No. 55)
Consider the relational database shown below. Give an expression in the relational algebra to express each of the following queries: a. Find the names of all employees who work for First Bank Corporation . b. Find the names and ... . employee (person name, street, city) works (person name, company name, salary) company (company name, city)
asked
Mar 25, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

15
views
databases
relationalmodel
relationalalgebra
–1
vote
0
answers
30
DBMS Korth Edition 6 Exercise 2 Question 10 (Page No. 54)
Consider the advisor relation shown in Figure , with s id as the primary key of advisor. Suppose a student can have more than one advisor. Then, would s id still be a primary key of the advisor relation? If not, what should the primary key of advisor be?
asked
Mar 23, 2019
in
Databases
by
ajaysoni1924
Boss
(
10.8k
points)

40
views
databases
relationalmodel
relationalalgebra
Page:
1
2
3
4
5
6
7
next »
Quick search syntax
tags
tag:apple
author
user:martin
title
title:apple
content
content:apple
exclude
tag:apple
force match
+apple
views
views:100
score
score:10
answers
answers:2
is accepted
isaccepted:true
is closed
isclosed:true
Recent Posts
ISRO CSE 2020 PAPER ANALYSE
BARC OCES/DGFS 2020
ISI CMI PDF by GATE Overflow
Management Trainee Recruitment COAL INDIA 2020
ECIL Interview Experience
Follow @csegate
Recent questions tagged relationalalgebra
Recent Blog Comments
CIL is a mining company and there is no CS/IT job...
On an all, IT branch is not eligible then,or is...
What was the answer for checksum field in tcp...
@CSHuB You need to choose "systems" as post...
@cshub.....if you are branch computer engineering...
50,741
questions
57,253
answers
198,069
comments
104,707
users