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Recent questions tagged relations

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1

DBMS
can we make weak entity type as composite attribute of another weak entity type?

striver23 asked in Databases Feb 4

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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

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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

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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

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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

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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

105 views

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

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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

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

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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

243 views

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

600 views

2 votes

3 answers

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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

530 views

4 votes

1 answer

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GO Classes Weekly Quiz 10 | Discrete Mathematics | Set Theory, Mathematical Logic, Lattice | Question: 1

GO Classes asked in Set Theory & Algebra May 12, 2022

377 views

3 votes

1 answer

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GO Classes Weekly Quiz 10 | Discrete Mathematics | Set Theory, Mathematical Logic, Lattice | Question: 12

GO Classes asked in Set Theory & Algebra May 12, 2022

206 views

3 votes

2 answers

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GO Classes Weekly Quiz 10 | Discrete Mathematics | Set Theory, Mathematical Logic, Lattice | Question: 14

GO Classes asked in Set Theory & Algebra May 12, 2022

289 views

2 votes

1 answer

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GO Classes Weekly Quiz 10 | Discrete Mathematics | Set Theory, Mathematical Logic, Lattice | Question: 15

GO Classes asked in Set Theory & Algebra May 12, 2022

205 views

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Recent questions tagged relations