Postgresql 中文操作指南

1. What Is PostgreSQL? #

PostgreSQL 是一个基于 POSTGRES, Version 4.2 的对象关系数据库管理系统 (ORDBMS)，在加州大学伯克利分校的计算机科学系开发。POSTGRES 率先提出了许多概念，直到很久以后才在某些商业数据库系统中提供这些概念。

PostgreSQL is an object-relational database management system (ORDBMS) based on POSTGRES, Version 4.2, developed at the University of California at Berkeley Computer Science Department. POSTGRES pioneered many concepts that only became available in some commercial database systems much later.

PostgreSQL 是该最初伯克利代码的开源后代。它支持 SQL 标准的大部分内容并提供许多现代化功能：

PostgreSQL is an open-source descendant of this original Berkeley code. It supports a large part of the SQL standard and offers many modern features:

此外，用户可以通过多种方式扩展 PostgreSQL，例如添加新的

Also, PostgreSQL can be extended by the user in many ways, for example by adding new

由于其宽松的许可方式，任何人均可免费使用、修改和分发 PostgreSQL，而与目的是私人的、商用的还是学术的无关。

And because of the liberal license, PostgreSQL can be used, modified, and distributed by anyone free of charge for any purpose, be it private, commercial, or academic.