What have you worked with in databases?

I have worked with various types of databases, including:

• Relational databases: PostgreSQL, MySQL, MS SQL Server. Used them for storing structured data, building complex queries with JOINs, transactions, and ensuring data integrity.

• NoSQL databases: MongoDB for document storage, Redis for caching and fast data access.

• Columnar databases: for example, ClickHouse for analytical tasks with large volumes of data.

In projects, I was involved in designing data schemas, optimizing queries, writing stored procedures and migrations, as well as integrating databases with applications.