> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/11/qian-yan/3.-guan-li.md).

# 3. 慣例

以下所提到慣例，用於指令的語法描述上（均為半型字元）：\
中括號（ **\[** 和 **]** ）指可選擇是否輸入的選項。（在Tcl指令的語法中，習慣使用問號？表達這樣的可選擇性）\
大括號（ **{** 和 **}** ）及垂直線（ **|** ）指的是必須要輸入的部份。\
連續句點（**...**）指的是該段落可以允許不斷重覆。

為了使說明更簡潔，SQL指令使用提示字元＂**=>**＂，作業系統命令列指令則使用＂**$**＂。雖然一般而言，提示字元可能不會顯示。

Administrator一般的定義是負責安裝及運行資料庫系統的人；User指的是任何正在使用資料庫的人，或者正要使用任何PostgreSQL相關系統的人。這些定義不應該被解釋得太過嚴格，在本文件中，對於系統管理的工作，並沒有固定的假設。


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