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Entities, Attributes and Relationships Video Lecture | SSC CGL Tier 2 - Study Material, Online Tests, Previous Year

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FAQs on Entities, Attributes and Relationships Video Lecture - SSC CGL Tier 2 - Study Material, Online Tests, Previous Year

1. What are entities, attributes, and relationships in database design?
Ans. In database design, entities are objects or concepts that can have attributes and are represented as tables. Attributes are properties or characteristics of an entity, while relationships define the associations between entities.
2. How are entities, attributes, and relationships represented in a database schema?
Ans. Entities are represented as tables in a database schema, with each table containing rows that represent individual instances of an entity. Attributes are represented as columns in the table, while relationships are represented through foreign keys that link the primary key of one table to the primary key of another.
3. What is the purpose of entities in a database design?
Ans. Entities in a database design help to organize and structure the data by representing real-world objects or concepts. They provide a way to store and retrieve information about these objects and enable efficient data management and manipulation.
4. Can an entity have multiple attributes?
Ans. Yes, an entity can have multiple attributes. Attributes define the properties or characteristics of an entity, such as its name, age, or address. Depending on the nature of the entity, it may have several attributes associated with it.
5. How are relationships between entities established in a database?
Ans. Relationships between entities in a database are established through the use of foreign keys. A foreign key is a column in one table that refers to the primary key of another table, creating a link between the two tables. This link allows for the representation of associations or connections between entities in the database.
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