Have you worked with databases? If yes, which ones? What exactly did you do with them?

Yes, I have worked with databases, mainly relational ones such as MySQL and PostgreSQL. In frontend development, I interacted with the database through APIs, wrote queries to retrieve and update data, and also optimized queries for better performance.

For example, to get a list of users with a specific filter, you can use an SQL query:

SELECT id, name, email FROM users WHERE status = 'active' ORDER BY created_at DESC;

I have also worked with NoSQL databases, such as MongoDB, for storing documents and quick data retrieval.

Overall, my work with databases included:

• designing queries for APIs
• optimizing indexes
• integrating with frontend via REST or GraphQL
• error handling and data validation