Conventions Used in This Book

Conventions Used in This Book The following typographical conventions are used in this book. Italic Used for filenames, directory names, table names, field names, and URLs. It is also used for emphasis and for the first use of a technical term. Constant width Used for examples and to show the contents of files and the output of commands. Constant width italic Used in syntax descriptions to indicate user-defined items. 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. UPPERCASE In syntax descriptions, indicates keywords. lowercase In syntax descriptions, indicates user-defined items such as variables. [ ] 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 brackets, as in {TRUE | FALSE}. ... In syntax descriptions, ellipses indicate repeating elements. Indicates a tip, suggestion, or general note. For example, we use notes to point you to useful new features in Oracle9i. Indicates a warning or caution. For example, we'll tell you if a certain SQL clause might have unintended consequences if not used carefully.