Have you had experience working with databases that do not use a relational model?

Yes, experience with NoSQL databases includes types such as:

• Document-oriented (e.g., MongoDB) — store data in JSON-like documents, suitable for flexible schemas.
• Key-value (e.g., Redis) — simple and fast model for storing key-value pairs.
• Graph (e.g., Neo4j) — optimal for storing and processing related data.
• Column-oriented (e.g., Cassandra) — effective for analytics and large data volumes.

Each type suits different tasks; for example, document-oriented databases are convenient for applications with dynamic schemas.