Despite the rise in popularity of NoSQL databases, relational databases still continue to be preferred for many applications. This is because of their strong querying abilities and their robustness.
Relational databases excel in running complex queries and reporting based on the data in cases where the data structure does not change frequently. Open-source relational databases like MySQL and PostgreSQL provide a cost-effective alternative as a stable production-grade database compared to licensed counterparts like Oracle, MSSQL, etc.