Recent questions tagged relations

Consider the relation schema $R(A,B,C)$.The domain sizes of the attributes are:$|D_A|=2$$|D_B|=2$$|D_C|=3$Assume that there are no constraints other than the domain const...

Which one of the following statements about the pure relational model and its database implementation is correct?A relation in the relational model is represented concept...

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason RAssertion A: Let $\mathrm{R} \subseteq \mathrm{A} \times \mathrm{A}$ b...

Let $R$ be a binary relation on the set $\{1,2, \ldots, 10\}$, where $(x, y) \in R$ if the product of $x$ and $y$ is square of an integer. Which of the following properti...

Consider the following relations on $\{1,2,3,4\}$. Which of the following relations are reflexive?$\mathrm{R}_{1}=\{(1,1),(1,2),(2,1),(2,2),(3,4),(4,1),(4,4)\}$$\mathrm{R...

Let $R=\{(1,2),(2,3),(3,3)\}$ be a relation defined on the set $\{1,2,3,4\}$. Then the minimum number of elements, needed to be added in $R$ so that R becomes an equivale...

The relation $R=\{(x, y): x, y \in \mathbb{Z}$ and $x+y$ is even $\}$ is:reflexive and transitive but not symmetric reflexive and symmetric but not transitive an equivale...

Let $\mathbf{A}=\{0,1,2,3,4,5\}$. Let $\mathbf{R}$ be a relation on $\mathbf{A}$ defined by $(\mathrm{x}, \mathrm{y}) \in \mathbf{R}$ if and only if $\max \{\mathrm{x}, \...

Let $R=\{(3,3),(6,6),(9,9),(12,12),(6,12),(3,9),(3,12),(3,6)\}$ be a relation on the set $A=$ $\{3,6,9,12\}$. The relation $R$ is:Reflexive and transitiveReflexive onlyAn...

​​Let $\mathcal{F}$ be the set of all functions from $\{1, \ldots, n\}$ to $\{0,1\}$. Define the binary relation $\leqslant$ on $\mathcal{F}$ as follows:$\forall f, g \in...

Visualizing Types of Relation in the form of Venn Diagram so that we can which relation can subset of whom , who are pairwise disjoint and who are proper subsets only an...

 Can someone help me out in giving example for each, For Example 1:N Both Mandatory : Person->No of Classes Attended, This can be (PersonName,ClassName) but how is the nu...