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Computer Science Engineering (CSE) Exam  >  Computer Science Engineering (CSE) Tests  >  Test: Concept of keys - 2 - Computer Science Engineering (CSE) MCQ

Test: Concept of keys - 2 - Computer Science Engineering (CSE) MCQ


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10 Questions MCQ Test - Test: Concept of keys - 2

Test: Concept of keys - 2 for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Test: Concept of keys - 2 questions and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus.The Test: Concept of keys - 2 MCQs are made for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Concept of keys - 2 below.
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Test: Concept of keys - 2 - Question 1
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Which one of the following is a set of one or more attributes taken collectively to uniquely identify a record?

Detailed Solution for Test: Concept of keys - 2 - Question 1
A super key is a set of one or more attributes that, taken collectively, can uniquely identify a record in a table. This includes primary keys, candidate keys, and any superset of them. For example, in a table of students, the combination of student ID and email could serve as a super key.
Test: Concept of keys - 2 - Question 2
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The subset of a super key is a candidate key under what condition?

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A candidate key is a minimal super key, meaning no proper subset of it can be a super key. If any subset of the super key is still a super key, it cannot be minimal. For instance, if {A, B} is a super key, neither {A} nor {B} alone can be a super key for it to be a candidate key.
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Test: Concept of keys - 2 - Question 3
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Relational Algebra is a __________ query language that takes two relations as input and produces another relation as output of the query.

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Relational algebra is a procedural query language, meaning it specifies a sequence of operations to perform on relations to achieve the desired result. It involves operations like selection, projection, and join that manipulate relations and produce a new relation.
Test: Concept of keys - 2 - Question 4
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Which of the following is a fundamental operation in relational algebra?
Detailed Solution for Test: Concept of keys - 2 - Question 4
The fundamental operations of relational algebra include selection, projection, union, set difference, Cartesian product, and rename. Set intersection and natural join are not considered fundamental operations but can be derived from these fundamental operations.
Test: Concept of keys - 2 - Question 5
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A __________ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique.
Detailed Solution for Test: Concept of keys - 2 - Question 5
A key is a property of the entire relation, ensuring that each tuple (row) in the relation is unique. This is fundamental to the concept of relational databases, where keys ensure the uniqueness and integrity of data. For instance, a primary key in a table uniquely identifies each record.
Test: Concept of keys - 2 - Question 6
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Which of the following is used to denote the selection operation in relational algebra?
Detailed Solution for Test: Concept of keys - 2 - Question 6
The selection operation in relational algebra is denoted by the Greek letter Sigma (σ). It is used to select tuples that satisfy a given predicate, such as σ_age > 30 (Employee).
Test: Concept of keys - 2 - Question 7
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For the select operation, the __________ appear in the subscript and the __________ argument appears in the parenthesis after the sigma.
Detailed Solution for Test: Concept of keys - 2 - Question 7
In the select operation, predicates (conditions) are written in the subscript, and the relation (table) to which these conditions apply is written in the parenthesis after the Sigma (σ). For example, σ_salary > 5000(Employee).
Test: Concept of keys - 2 - Question 8
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The relation with the attribute which is the Primary key is referenced in another relation. The relation which has the attribute as Primary key is called __________.
Detailed Solution for Test: Concept of keys - 2 - Question 8
The relation that contains the primary key is called the referenced relation. This is because it is referenced by a foreign key in another relation. For example, if "Department" is referenced by "Employee" through a foreign key, "Department" is the referenced relation.
Test: Concept of keys - 2 - Question 9
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An attribute in a relation is a foreign key if the __________ key from one relation is used as an attribute in that relation.
Detailed Solution for Test: Concept of keys - 2 - Question 9
A foreign key in a relation is an attribute that is a primary key in another relation. This key ensures referential integrity between the two relations. For example, in a "Student" table, "DepartmentID" could be a foreign key referencing the "DepartmentID" in a "Department" table.
Test: Concept of keys - 2 - Question 10
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For each attribute of a relation, there is a set of permitted values, called the __________ of that attribute.
Detailed Solution for Test: Concept of keys - 2 - Question 10

The domain of an attribute is the set of permissible values that it can take. This defines the nature of the data that can be stored in the attribute. For example, the domain of an attribute "age" could be all positive integers.

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