The following typographical conventions are used in this book:
Italic
Indicates emphasis and new terms, as well as book titles.
Constant width
Indicates SQL and, generally speaking, programming languages' keywords; table, index and column names; functions; code; or the output from commands.
Constant width bold
Shows commands or other text that should be typed literally by the user. This style is used only in code examples that mix both input and output.
Constant width italic
Shows text that should be replaced with user-supplied values.
This icon signifies a maxim and summarizes an important principle in SQL.
This is a tip, suggestion, or general note. It contains useful supplementary information about the topic at hand.