In what cases and for what tasks is the use of relational databases based on SQL applied?

Relational databases based on SQL are used in cases where data has a clear structure and relationships between entities, such as in accounting systems, banking applications, CRM, ERP, and other business applications. They are well-suited for tasks where data integrity, transactional consistency, and the ability to perform complex queries with table joins, filtering, and aggregation are important.

Main usage scenarios:

• Storing structured data with clear relationships (e.g., users, orders, products).
• Ensuring data integrity through constraints (primary keys, foreign keys).
• Performing complex analytical queries and reports.
• Supporting transactions to guarantee data consistency.

Example: an online store stores information about customers, orders, and products in a relational database to quickly generate sales reports and track order statuses.