The following conventions are used in the synopsis of a command:
optional parts. (In the synopsis of a Tcl command, question marks
?) are used instead, as is usual in Tcl.) Braces
}) 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
=>, and shell commands are preceded by the
$. 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.