Modelagem de Dados - O que são Atributos

Introduction to Data Modeling

In this section, Fábio from Bola Treinamentos introduces the topic of data modeling and discusses attributes used to describe entity characteristics.

Attributes in Data Modeling

• Attributes are used to describe characteristics of an entity.

• They can be represented by a line connecting the attribute name to the entity.

• Ellipses are commonly used for attributes, but if it becomes cluttered, other symbols can be used.

• Attributes can be classified based on their importance and type.

• Determinant attributes uniquely determine instances of an entity and do not repeat within the database.

• Key attributes are used to identify specific instances of an entity and may repeat depending on the type of key being used.

• Composite attributes consist of two or more combined attributes.

Handling Multiple Values for an Attribute

This section discusses how to handle multiple values for an attribute in a database.

Handling Multiple Values

• Some entities may have multiple values for a single attribute, such as having multiple phone numbers for a contact.

• Techniques like normalization can be applied to handle these cases effectively.

Determinant Attributes

This section explains determinant attributes and their role in uniquely identifying instances of an entity.

Determinant Attributes

• Determinant attributes ensure that no two instances of an entity are identical, even if they have similar information in other fields.

• Examples include unique identifiers like CNPJ (company registration number) or product codes.

Identifiers and Keys

This section discusses identifiers and keys used in data modeling.

Identifiers and Keys

• A key is used to identify a specific instance of an entity.

• The difference between a determinant attribute and a key is that determinant attributes never repeat, while keys can repeat depending on the type of key being used.

• Composite keys consist of two or more combined attributes.

Building Entity Models

This section focuses on building entity models by combining attributes.

Building Entity Models

• Attributes are combined to give shape to the entity model.

• Determinant and key attributes play important roles in defining entities.

• The type of key used should be identified and represented in the model.

Timestamps may not be available for all sections.

Entity Relationships in a Database

In this section, the speaker discusses how to relate one entity to another entity in a database. They also mention a training opportunity and invite viewers to visit their website.

Relating Entities in a Database

• The speaker explains the concept of relating entities in a database.

• They discuss how to establish relationships between different entities.

• The importance of understanding entity relationships for effective database design is emphasized.

Please note that the provided transcript is in Portuguese.