Conventions

The following typographical conventions are used in this book:

Italic

Used for commands, utilities, filenames, directory names, table names, field names, and example URLs. It is also used for emphasis and for the first use of a technical term.

Constant width

Used for parameters, examples, and to show the contents of files and the output of commands.

Constant width italic

Used in syntax diagrams and parameter descriptions to indicate items that the user must supply.

Constant width bold

Indicates user input in examples showing an interaction. Also indicates emphasized code elements to which you should pay particular attention.

Constant width bold italic

Used in code examples to emphasize aspects of the SQL statements, or results, that are under discussion.

[ ]

In syntax descriptions, square brackets enclose optional items.

{ }

In syntax descriptions, curly brackets enclose a set of items from which you must choose only one.

|

In syntax descriptions, a vertical bar separates the items enclosed in curly or square brackets, as in {TRUE | FALSE}.

ALL CAPS

Used for datatypes, column names, roles, privileges, clauses, and fields.

Underline

In syntax descriptions, the underline text indicates the default value for a parameter.

. . .

In syntax descriptions, ellipses indicate repeating elements. In examples, they indicate unimportant text in the output.

Tip

Indicates a tip, suggestion, or general note.

Warning

Indicates a warning or caution; for example, a certain utility might have unintended consequences ...

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