DS- GROUP 6

1. A relation R is _______ if the matrix diagonal elements are 1.

• • Reflexive

• • Symmetric

• • Antisymmetric

• • Super Symmetric

This matrix has ________ property of a matrix.

• Antisymmetric

• Super symmetric

• Reflexive

• Symmetric

1. M_{R1 U R2} = M_{R1 ∨ MR2} ; M_{R1 ∩ R2} = M_{R1 ^ MR2}

• True

• False

What is a database schema?

• A representation of data in tabular form.

• A set of rules that govern database interactions.

• A visual diagram of database tables and their relationships.

• A logical blueprint that defines the structure and organization of a database.

Which of the following is used to uniquely identify a record in a database table?

• Index

• Foreign Key

• Primary Key

• Trigger

Which of the following operations in n-ary relations combines tuples from two relations based on a common attribute?

• 
  

  Projection

• Union

• Intersection

• Join

Which of the following operations in n-ary relations selects a subset of attributes from a relation?

• Projection

• Selection

• Difference

• Division

What does the term "degree" refer to in an n-ary relation?

• 
  The number of elements in each set
  

• The number of sets or domains involved in the relation

• The total number of elements in all the sets combined

• The number of connections or relationships in the relation 

 In the context of relational databases, an n-ary relation is defined as:

• Any set that involves more than two sets

• A relation that connects n elements from a single set

• A relation that connects n elements from n different sets  

• A relation that connects exactly three sets together

Which of the following best describes the domains of an n-ary relation?

• The elements that are connected in the relation

• The number of connections or relationships in the relation

• The sets or categories from which the elements come

• The degree of the relation