SQL, Structured Query Language, is the de facto programming language of the Data World.
Invented back in the 1970s, it was initially used for Relational Databases but now it has grown well beyond that and it an essential tool in "Big Data".
The language definition of SQL is maintained by ANSI.
The core of the language is virtually the same regardless of DBMS with vendor specific dialects.
WE are experienced in Oracle, Microsoft SQL Server, MySQL, PostgreSQL, and many other platforms.
So called "NoSQL" systems are mostly column storage with key - values.
And there is SQL code used to query these systems as well.
SQL is a very powerful language with a long history, and it will continue into the future in its place of promenance in the Data World.