SQL server and SQL Express are RDBMS (relational database management systems) that run on platforms (physical hardware, such as workstations or servers).

SQL Server与SQL Express是在平台(物理性硬件，例如工作站或者服务器)上运行的RDBMS(关系数据库管理系统)。

youdao

Once you understand SQL, you’ll have a much better grasp on the limitations of an RDBMS.

一旦你理解了SQL，你会更好地领会一个关系型数据库管理系统的局限性。

youdao

The Standard Query Language (SQL) is a wonderfully compact means of expressing exactly what data interests you within an RDBMS database.

“标准查询语言(SQL)”是一种能够确切表达RDBMS数据库中您所感兴趣的数据的极其简洁的方法。

youdao

Now, RDBMS and SQL somewhat goes directly against the principles that forced Hadoop to be created in the first place, which is requirement to have a predefined structure (known as a schema) of the data being stored.

FORBES: Combating the Big Data skills shortage

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