Data Modeling

Designing data structures

Data modeling involves designing the structure of data for an application or system. It includes creating a conceptual model, a logical model, and a physical model of the data, which can help in understanding the relationships between various data entities and their attributes.

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Big Data Scientist - Data Modeling Example Questions

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Question 1

What is a physical data model?

A data model that is represented in XML format A data model that shows how data is stored in the database A data model that illustrates how data is transformed during ETL (extract-transform-load) process A data model that describes the relationship between data An ERD (entity relationship diagram)

Correct Answer: A data model that shows how data is stored in the database

A physical data model provides a detailed view of how data is stored in the database in the form of tables, columns, and indexes, among others.

Question 2

What is a one-to-many relationship in data modeling?

A relationship between two entities where instances of the first entity are not associated with instances of the second entity. A relationship between two entities where one instance of the first entity can be associated with multiple instances of the second entity. A relationship between two entities where each instance of the first entity can be associated with only one instance of the second entity. A relationship between two entities where instances of the second entity can be associated with multiple instances of the first entity. A relationship between three or more entities where multiple instances of one entity can be associated with multiple instances of another entity. A relationship between two entities where instances of the first entity have a direct dependency on instances of the second entity.

Correct Answer: A relationship between two entities where one instance of the first entity can be associated with multiple instances of the second entity.

In data modeling, a one-to-many relationship is a relationship between two entities where one instance of the first entity can be associated with multiple instances of the second entity. This is a common type of relationship in databases and is often used to model situations where one entity (such as a customer) can have multiple instances of another entity (such as orders).

Question 3

What is an entity-relationship diagram (ERD)?

A graphical representation of entities and their relationships to each other within a data model. A program that creates data models automatically. A method for importing data into a database. A type of database that stores entities and their associated data. A document that outlines the data model in written form.

Correct Answer: A graphical representation of entities and their relationships to each other within a data model.

An entity-relationship diagram (ERD) is a graphical representation of entities and their relationships to each other within a data model. It typically uses shapes such as squares and diamonds to represent entities and relationships, and lines to connect them. The other wrong answers describe processes or technologies that are not specific to ERDs.

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