Because of the higher level of abstraction it provides, SQL, unlike procedural languages, lets programmers focus on what data they need, not how to retrieve it.

由于SQL与过程化语言不同，它提供了更高的抽象级别，因此它可以让程序员把精力集中到他们需要什么样的数据，而不是如何检索数据。

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Among the many query languages, Structured query language (SQL) is a language designed and optimized for querying certain kinds of relational databases.

在众多查询语言之中，结构化查询语言(SQL)是一种针对查询特定类型的关系库而设计和优化的语言。

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Object query languages still do not relieve you from having to know SQL, since you often need to know how to fine tune query languages.

对象查询语言仍不能免除必须了解SQL，这是因为通常需要了解如何调优查询语言。

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