通过提供一种公共语言，SQL简化了DBA、系统程序员、应用程序员、系统分析员和最终用户之间的通信。

By providing a common language, SQL eases communication among DBAs, systems programmers, application programmers, systems analysts, and end users.

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定义语法分析器类，应用程序员将定义一个'handler '类，该类将注册所使用的语法分析器。

Instead of defining a parser class, an application programmer defines a 'handler' class that is registered with whatever parser is used.

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应用程序员将定义一个handler类，而不是语法分析器类，该handler类能注册到任何所使用的语法分析器中。

Instead of defining a parser class, an application programmer defines a handler class that is registered with whatever parser is used.

youdao

应用程序员将定义一个handler类，而不是语法分析器类，该handler类能注册到任何所使用的语法分析器中。

Instead of defining a parser class, an application programmer defines a handler class that is registered with whatever parser is used.

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