Work with a relational database: Structured Query language.

处理关系数据库：结构化查询语言。

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As the article already mentioned, YQL is a SQL-like language to query structured data in the Web.

上文已经提到过，YQL是一种类似于SQL的语言，可在Web中查询结构化数据。

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The query on the index would have been performed using standard Structured Query Language (SQL).

对索引的查询将使用标准结构化查询语言（Structured Query Language，SQL）来执行。

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This traditional database platforms, known as relational database management systems (RDBMS) all use a language called SQL (structured query language).

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