Postgresql 中文操作指南

本部分介绍如何通过用户定义函数、数据类型、触发器等扩展服务器功能。这些是高级主题，通常应该在了解有关 PostgreSQL 的所有其他用户文档之后再进行探讨。本部分的后面章节描述了 PostgreSQL 发行版中可用的服务器端编程语言以及有关服务器端编程语言的常见问题。在深入研究有关服务器端编程语言的资料之前，必须至少阅读 Chapter 38 (涵盖函数) 的前面部分。

This part is about extending the server functionality with user-defined functions, data types, triggers, etc. These are advanced topics which should probably be approached only after all the other user documentation about PostgreSQL has been understood. Later chapters in this part describe the server-side programming languages available in the PostgreSQL distribution as well as general issues concerning server-side programming languages. It is essential to read at least the earlier sections of Chapter 38 (covering functions) before diving into the material about server-side programming languages.

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