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Recent questions tagged relations
1
vote
1
answer
1
DBMS
can we make weak entity type as composite attribute of another weak entity type?
striver23
asked
in
Databases
Feb 4
by
striver23
126
views
databases
relations
0
votes
0
answers
2
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.
Sahil_Lather
asked
in
Mathematical Logic
Jan 27
by
Sahil_Lather
64
views
discrete-mathematics
relations
testbook-test-series
0
votes
0
answers
3
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 and R ... 4 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.
Sahil_Lather
asked
in
Mathematical Logic
Jan 27
by
Sahil_Lather
6
views
discrete-mathematics
relations
0
votes
1
answer
4
#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?
Dknights
asked
in
Set Theory & Algebra
Jan 2
by
Dknights
126
views
set-theory&algebra
relations
functions
2
votes
1
answer
5
All reflexive relations are anti-symmetric
Is the statement true that all reflexive relations are anti-symmetric?
h4kr
asked
in
Mathematical Logic
Dec 27, 2022
by
h4kr
104
views
relations
discrete-mathematics
engineering-mathematics
0
votes
0
answers
6
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.
rkumar16
asked
in
Databases
Nov 16, 2022
by
rkumar16
105
views
databases
relations
sql
1
vote
2
answers
7
#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)
Dknights
asked
in
Set Theory & Algebra
Nov 4, 2022
by
Dknights
149
views
set-theory&algebra
relations
functions
binary-operation
0
votes
0
answers
8
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.
Yamini_learner
asked
in
Set Theory & Algebra
Sep 26, 2022
by
Yamini_learner
113
views
relations
0
votes
1
answer
9
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
rohitkaushal1
asked
in
Databases
Sep 25, 2022
by
rohitkaushal1
245
views
relational-algebra
databases
relations
gateforum-test-series
0
votes
0
answers
10
Database: Minimum number of tuples
Consider a relation schema r(A, B, C). Number of elements in domain of attributes A, B and C are 4, 10 and 17 respectively. “ Minimum ” number of tuples possible in an instance of relation r is ________.
Shreya2002
asked
in
Databases
Aug 9, 2022
by
Shreya2002
243
views
databases
relations
4
votes
1
answer
11
GO Classes Scholarship 2023 | Test | Question: 1
A relation $\text{R}$ on a set $\text{A}$ is said to be Total Relation iff $a\text{R}b$ Or $b\text{R}a$ Or both, for all $a,b \in \mathrm{A}$. Which of the following options is/are false? Every Total relation is ... total and transitive, then $\mathrm{S}$ is an equivalence relation. The number of total relations on a set of $5$ elements is $1024.$
GO Classes
asked
in
Set Theory & Algebra
Aug 7, 2022
by
GO Classes
600
views
goclasses-scholarship-test1
goclasses
set-theory&algebra
relations
multiple-selects
2-marks
2
votes
3
answers
12
GO Classes Scholarship 2023 | Test | Question: 2
Let $\text{S}$ be the set of all bit-strings of length $7 .$ We define a relation $\mathrm{R}$ on the set $\mathrm{S}$ by the rule that $x\mathrm{R}y$ iff $x$ and $y$ ... such that $\forall j \neq i, x_{j}=y_{j}$ and $x_{i} \neq y_{i}$. What is the cardinality of relation $\mathrm{R}$?
GO Classes
asked
in
Set Theory & Algebra
Aug 7, 2022
by
GO Classes
530
views
goclasses-scholarship-test1
numerical-answers
goclasses
set-theory&algebra
relations
2-marks
4
votes
1
answer
13
GO Classes Weekly Quiz 10 | Discrete Mathematics | Set Theory, Mathematical Logic, Lattice | Question: 1
GO Classes
asked
in
Set Theory & Algebra
May 12, 2022
by
GO Classes
377
views
goclasses_wq10
goclasses
set-theory&algebra
relations
1-mark
3
votes
1
answer
14
GO Classes Weekly Quiz 10 | Discrete Mathematics | Set Theory, Mathematical Logic, Lattice | Question: 12
GO Classes
asked
in
Set Theory & Algebra
May 12, 2022
by
GO Classes
206
views
goclasses_wq10
goclasses
set-theory&algebra
relations
2-marks
3
votes
2
answers
15
GO Classes Weekly Quiz 10 | Discrete Mathematics | Set Theory, Mathematical Logic, Lattice | Question: 14
GO Classes
asked
in
Set Theory & Algebra
May 12, 2022
by
GO Classes
289
views
goclasses_wq10
goclasses
set-theory&algebra
relations
partial-order
2-marks
2
votes
1
answer
16
GO Classes Weekly Quiz 10 | Discrete Mathematics | Set Theory, Mathematical Logic, Lattice | Question: 15
GO Classes
asked
in
Set Theory & Algebra
May 12, 2022
by
GO Classes
205
views
goclasses_wq10
numerical-answers
goclasses
set-theory&algebra
relations
2-marks
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Recent questions tagged relations
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