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Relation Attributes and Constraints Quiz

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Relation Attributes and Constraints Quiz

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Questions and Answers

What is a superkey in the context of relational databases?

A set of all attributes in a relation that specifies no two tuples can have the same value (correct)

A procedural query language for relational databases

A set of attributes that uniquely identify the tuples in a relation

A constraint that specifies whether null values are permitted or not

What is the purpose of the entity integrity constraints in relational databases?

To declare primary keys for the entities

To operate on pairs of relationships using binary operations

To specify that no primary key value can be null (correct)

To create a table for each entity

What is the function of the select operation in relational algebra?

Specifying whether null values are permitted or not

Declaring primary keys for the entities

Selecting tuples that satisfy a given predicate (correct)

Creating a table for each entity

What is the DEGREE OF A RELATION?

The total number of attributes in a relation schema Signup and view all the answers

Which type of constraint is DOMAIN CONSTRAINTS?

Schema-based constraints Signup and view all the answers

What is the purpose of KEY CONSTRAINTS?

To ensure that each tuple in a relation is unique Signup and view all the answers

What does SQL stand for?

Structured Query Language Signup and view all the answers

Which SQL component is used to modify database schema?

DDL Signup and view all the answers

What is the purpose of Cartesian product in SQL?

Combining information of two different relations into one relation Signup and view all the answers

Which SQL keyword is used to delete data from a database?

DELETE Signup and view all the answers

Study Notes

Relational Databases

A superkey is a set of attributes that uniquely identifies a tuple in a relation.
Entity integrity constraints ensure that each tuple in a relation has a unique value for the primary key.

Relational Algebra

The select operation is used to select a subset of tuples from a relation that satisfies a given condition.

Relations

The degree of a relation is the number of attributes in a relation.

Constraints

Domain constraints are constraints that apply to a single attribute or column of a relation, restricting the set of values it can take.
Key constraints are used to ensure that each tuple in a relation has a unique value for the primary key.

SQL

SQL stands for Structured Query Language.
The DDL (Data Definition Language) component of SQL is used to modify the database schema.
The Cartesian product operation in SQL is used to combine each row of one relation with each row of another relation.
The DELETE keyword is used to delete data from a database.

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Description

Test your knowledge on relation attributes, degrees of a relation, cardinality, and relational model constraints with this quiz. Learn about defining relation schemas, counting attributes, and understanding the total number of tuples in a relation. Explore the concept of constraints in relational models.