Exam DP-900 topic 1 question 139 discussion

"B" is the correct answer. https://www.coursera.org/lecture/explore-core-data-concepts-microsoft-azure/explore-the-characteristics-of-non-relational-data-nP41V

option B

A characteristic of non-relational data is B. self-describing entities. This means that each entity, such as a document or a graph node, contains all the information necessary to describe itself and its attributes, without relying on a predefined schema or structure12. This makes non-relational data more flexible and adaptable to different types of data and queries.

This question appeared in the 07/07/23 exam.

Answer of chatGPT with argument : B. self-describing entities One of the characteristics of non-relational data is that it often consists of self-describing entities. Unlike in a relational database where the schema is predefined and structured, non-relational data allows for more flexibility in the structure and schema. Each entity can have its own set of properties and attributes, and the data itself carries information about its structure and meaning. This self-descriptive nature of non-relational data allows for dynamic and adaptable data models.

B. self-describing entities One of the main characteristics of non-relational data is that it is self-describing, meaning that each data item includes information about its own structure and schema. This is in contrast to relational data, which requires a well-defined schema and predefined relationships between tables. *Indexes and unique key values are not necessarily absent in non-relational data. Many non-relational databases do support indexing and can enforce uniqueness constraints, but these features are often implemented differently than in relational databases.

https://learn.microsoft.com/en-us/azure/architecture/data-guide/big-data/non-relational-data#document-data-stores

Can't be D as there're document keys, keys in key-value, etc.

can't be D- it suggests unique key (which some non-relational stores (like document and key-value) have; relational data has primary and foreign key.

Repeated question with #219 where "No unique keys" is not an option, thus answer is B

Exam: 20/10/2022

stated in this resource there are no tables, rows, primary keys or foreign keys. Instead, the non-relational database uses a storage model optimized for specific requirements of the type of data being stored. https://www.pluralsight.com/blog/software-development/relational-vs-non-relational-databases