What types of databases use SQL for data operations?

SQL (Structured Query Language) is used for working with relational databases (RDBMS). The main types of databases that use SQL:

• Relational databases: data is stored in tables with clearly defined relationships between them. Examples: MySQL, PostgreSQL, Oracle Database, Microsoft SQL Server.
• Some NewSQL databases: modern systems that support NoSQL scalability but use SQL for queries (e.g., CockroachDB).

Unlike NoSQL databases, which may use other query languages or APIs, SQL is specifically used for structured data with a fixed schema.