Is it possible to access non-relational databases using SQL?

It is generally not possible to directly access non-relational databases using SQL, as SQL is a query language developed for relational databases with a tabular structure. However, some NoSQL databases provide their own SQL-like interfaces or support a limited set of SQL queries for user convenience. For example, databases like NewSQL or some engines for document-oriented databases may support SQL-like syntax.

Overall, working with NoSQL databases often involves using their own APIs or query languages, such as MongoDB which uses BSON queries, or Cassandra which uses CQL (similar to SQL but with limitations). Therefore, the ability to use SQL depends on the specific NoSQL DBMS and its capabilities.