PostgreSQL命令中的约定习俗Conventions
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The following conventions are used in the synopsis of a command: brackets ([ and ]) indicate optional parts. (In the synopsis of a Tcl command, question marks (?) are used instead, as is usual in Tcl.) Braces ({ and }) and vertical lines (|) indicate that you must choose one alternative. Dots (...) mean that the preceding element can be repeated.
Where it enhances the clarity, SQL commands are preceded by the prompt =>, and shell commands are preceded by the prompt $. Normally, prompts are not shown, though.
An administrator is generally a person who is in charge of installing and running the server. A user could be anyone who is using, or wants to use, any part of the PostgreSQL system. These terms should not be interpreted too narrowly; this book does not have fixed presumptions about system administration procedures.
在命令的语法概要中使用以下约定：括号[]之间的表示可选部分.(在Tcl命令的概要中，问号(?)被代替，像tcl中通常使用的那样。)，{}和|表示参数必选一个。...表示可以重复前面的参数。
为了方便查看，SQL命令以=>提示，shell命令以$提示。当然，一般情况下，实际执行的时候，提示是不会显示的。
管理员的职责一般是安装和管理服务端。用户可以是在用、或者是想用PostgreSQL系统某一部分的任何人。
这些术语不应该狭义的理解。本文档并没有对系统管理过程做固定的假定。
