relational database language

基本解释

NT1 is a conformance test system based on the knowledge base for the relational database SQL language standard.
NT1是基于知积库的关系数据库SQL标准一致性测试系统。
Traditional relational database query language SQL is designed for relational tables, and not suitable for XML or GML semistructured data;
传统的关系数据库查询语言SQL是针对平面的二维关系数据而设计的，并不适合XML/GML半结构化数据的查询；
Most important, many problems are much easier to solve with a native XML database and XQuery than with a relational database and Structured Query Language (SQL).
最重要的是，和关系数据库以及结构化查询语言（SQL）相比，使用原生 XML 数据库和 XQuery 将更容易解决众多问题。

This traditional database platforms, known as relational database management systems (RDBMS) all use a language called SQL (structured query language).
FORBES: Combating the Big Data skills shortage