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Entity-Relationship Diagram Quiz

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Questions and Answers

How many independent relations would be created from the ERD?

5
6 (correct)
4
7

Which of the following options wrongly estimates the number of tables generated from the ERD?

6
8 (correct)
7
5

If the ERD contains multiple entities with various types of relationships, what would be the implication for the number of tables?

Fewer than 4 tables
At least as many as there are entities (correct)
More than 10 tables
Exactly 8 tables

Which of these statements best reflects the relationship between entities and the generated tables?

<p>Every entity directly corresponds to a table. (B)</p> Signup and view all the answers

What could likely influence the exact number of tables produced from an Entity-Relationship Diagram?

<p>The types of relationships (one-to-one, one-to-many, many-to-many). (D)</p> Signup and view all the answers

Flashcards

ERD

An Entity-Relationship Diagram (ERD) is a visual representation of data entities and their relationships within a database. It's used to design database structures before implementation.

Relational Schema

A relational schema is a blueprint for how data will be organized into tables, with columns representing attributes and rows containing individual records.

Entity

In an ERD, an entity is a distinct object or concept that you want to store data about in a database.

Relationship

Relationships in an ERD define how entities are connected and how data is shared between them.

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Number of Tables

A relational schema normally has one table (relation) for each entity in an ERD. So, the number of tables is usually equal to the number of entities.