因为SQL是一种非过程化语言，所以一条语句可以代替一系列过程。

Because SQL is a non-procedural language, a single statement can take the place of a series of procedures.

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PL/SQL是ORACLE的过程化语言，包括一整套的数据类型、条件结构、循环结构和异常处理结构。

PL/SQL is a process language of ORACLE, including a complete set of data categories, conditional structure, loop structure and exceptional processing structure.

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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。

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.

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