处理关系数据库：结构化查询语言。

Work with a relational database: Structured Query language.

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关系数据库使用结构化查询语言(Structured Query Language, SQL)以便从多个表和列中提取信息，但是键值存储仅限于对键列的操作。

Relational databases use Structured Query Language (SQL) to pull information from multiple tables and columns, but key-value stores are limited to operations on the key column.

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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。

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).

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