Google Data Analytics Professional Certification Practice Test

What defines a relational database?

1. A single table of data

2. A series of related tables connected via relationships

3. A database only containing metadata

4. A collection of non-related data entries

The correct answer is: A series of related tables connected via relationships

A relational database is characterized by its use of a series of related tables that are interconnected through defined relationships. These relationships allow for the organization of data in an efficient manner, facilitating complex queries and ensuring data integrity. In a relational database, each table typically represents a different entity, and the relationships between these tables are established through keys, such as primary keys and foreign keys. The ability to connect tables means that data can be stored in a normalized format, minimizing redundancy and promoting consistency. This structure enables users to perform operations across multiple tables seamlessly, which is a core feature of relational databases. The use of Structured Query Language (SQL) for managing and querying these tables enhances the functionality and accessibility of the data stored within them. In contrast, other options describe different concepts. A single table of data lacks the relationships that define relational databases, while a database containing only metadata doesn't have the necessary data entries for typical operations. A collection of non-related data entries fails to utilize the relational aspect, which is fundamental to relational databases. Thus, the concept of interrelated tables is essential to understanding what defines a relational database.