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Recent questions tagged relations
0
votes
2
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31
Entity Relationship & Relational Model ( ACE Bits and Bytes)
Construct an E-R model for the below assumption and find out the degree of the relationship :- A technician uses exactly one notebook for each project.Each notebook belongs to one technician for each project.Note that a technician ... different notebooks for different projects (a) Unary (b) Binary ( c ) Ternary (d) Two binary relations
Construct an E-R model for the below assumption and find out the degree of the relationship :-A technician uses exactly one notebook for each project.Each notebook belong...
akaash897
281
views
akaash897
asked
Apr 19, 2023
Databases
databases
relations
+
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1
votes
1
answer
32
GO Classes 2023 | IIITH Mock Test 1 | Question: 1
Let $\text{R}$ be a relation from a set $\text{A}$ to a set $\text{B}.$ The inverse relation from $\text{B}$ to $\text{A},$ denoted by $\text{R}^{-1},$ is the set of ordered pairs $\{(b,a) \mid (a,b) \in R\}$ ... $\text{S1}$ Only $\text{S2}$ Both $\text{S1}$ and $\text{S2}$ None of the above
Let $\text{R}$ be a relation from a set $\text{A}$ to a set $\text{B}.$ The inverse relation from $\text{B}$ to $\text{A},$ denoted by $\text{R}^{-1},$ is the set of orde...
GO Classes
596
views
GO Classes
asked
Mar 26, 2023
Set Theory & Algebra
goclasses2023-iiith-mock-1
goclasses
set-theory&algebra
relations
1-mark
+
–
3
votes
2
answers
33
GO Classes 2023 | IIITH Mock Test 1 | Question: 2
Given a set of values $\text{R} = \{1,2,3,4,5,6,7\}.$ The number of relations on this set which are both partial-order and equivalence relation is? $128$ $1$ $0$ $2^{42}$
Given a set of values $\text{R} = \{1,2,3,4,5,6,7\}.$ The number of relations on this set which are both partial-order and equivalence relation is?$128$$1$$0$$2^{42}$
GO Classes
655
views
GO Classes
asked
Mar 26, 2023
Set Theory & Algebra
goclasses2023-iiith-mock-1
goclasses
set-theory&algebra
relations
partial-order
1-mark
+
–
5
votes
1
answer
34
TIFR CSE 2023 | Part A | Question: 4
Let $\mathbb{R}$ be the set of all real numbers. Consider the relation $T$ defined as \[ T=\{(x, y) \in \mathbb{R} \times \mathbb{R} \text { such that } 4+x y>0\} \] $($Recall that ... but not symmetric an equivalence relation reflexive and symmetric but not transitive symmetric but not reflexive and not transitive symmetric and transitive but not reflexive
Let $\mathbb{R}$ be the set of all real numbers. Consider the relation $T$ defined as\[T=\{(x, y) \in \mathbb{R} \times \mathbb{R} \text { such that } 4+x y>0\}\]$($Recal...
admin
410
views
admin
asked
Mar 14, 2023
Set Theory & Algebra
tifr2023
set-theory&algebra
relations
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1
votes
1
answer
35
DBMS
can we make weak entity type as composite attribute of another weak entity type?
can we make weak entity type as composite attribute of another weak entity type?
striver23
386
views
striver23
asked
Feb 4, 2023
Databases
databases
relations
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–
0
votes
0
answers
36
Testbook Relations in discrete maths
Which of the following statement is not true? 1 If a relation on a set A is symmetric and transitive then R is reflexive. 2 If a relation R on a set A is irreflexive and transitive then R is antisymmetric. 3 If R is antisymmetric relation then R ꓵ S ... If R and S are transitive relation on a set A then R U S need not be transitive and R ꓵ S are also transitive.
Which of the following statement is not true?1If a relation on a set A is symmetric and transitive then R is reflexive.2If a relation R on a set A is irreflexive and tran...
Sahil_Lather
432
views
Sahil_Lather
asked
Jan 27, 2023
Mathematical Logic
discrete-mathematics
relations
testbook-test-series
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0
votes
1
answer
37
#gateappliedcourse
Let A={x,y,z}. The number of relations containing (x,y) and (x,z) which are reflexive and symmetric but not transitive is?
Let A={x,y,z}. The number of relations containing (x,y) and (x,z) which are reflexive and symmetric but not transitive is?
Dknights
389
views
Dknights
asked
Jan 2, 2023
Set Theory & Algebra
set-theory&algebra
relations
functions
+
–
2
votes
1
answer
38
All reflexive relations are anti-symmetric
Is the statement true that all reflexive relations are anti-symmetric?
Is the statement true that all reflexive relations are anti-symmetric?
h4kr
338
views
h4kr
asked
Dec 27, 2022
Set Theory & Algebra
relations
discrete-mathematics
+
–
0
votes
1
answer
39
DBMS EXAM Question
Write an SQL query For every company -- including companies with no divisions -- find, and output, the company and the number of divisions it has. In this question you may not use any embedded SFW's, nor may you use any embedding operators, ... <relational operator> SOME, or <relational operator> ANY. Additionally, you may use GROUP BY, but you may not use HAVING.
Write an SQL query “For every company including companies with no divisions find, and output, the companyand the number of divisions it has.” In this question you...
rkumar16
308
views
rkumar16
asked
Nov 16, 2022
Databases
databases
relations
sql
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–
1
votes
2
answers
40
#Unacademy
Find inverse in a*b=a+b-ab for all a,b belongs to Q-{-1}. where Q is a rational number? please explain how the inverse will satisfy the equation of inverse(a*b=b*a=e)
Find inverse in a*b=a+b-ab for all a,b belongs to Q-{-1}. where Q is a rational number?please explain how the inverse will satisfy the equation of inverse(a*b=b*a=e)
Dknights
460
views
Dknights
asked
Nov 4, 2022
Set Theory & Algebra
set-theory&algebra
relations
functions
binary-operation
+
–
0
votes
0
answers
41
Topic: Combining relations (Composition of relations)
Let R be a relation. Why $R^2 oR^2 !=R^4$ while $R^3 oR =R^4$? Please explain.
Let R be a relation.Why $R^2 oR^2 !=R^4$ while $R^3 oR =R^4$?Please explain.
Yamini_learner
309
views
Yamini_learner
asked
Sep 26, 2022
Set Theory & Algebra
relations
+
–
1
votes
1
answer
42
DBMS relational algebra
Information about a collection of students is given by the relation studinfo (studid, name, sex). The relation enroll (studld, Courseld) gives which student has enrolled for (or taken) what course(s). Assume that every course is taken by at least one ... a proper subset of female students are enrolled (c) Courses in which only male students are enrolled (d) None of the above
Information about a collection of students is given by the relation studinfo (studid, name, sex). The relation enroll (studld, Courseld) gives which student has enrolled ...
rohitkaushal1
717
views
rohitkaushal1
asked
Sep 25, 2022
Databases
relational-algebra
databases
relations
gateforum-test-series
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