Note that the text of examples appears in a different font than the text of the guide. Keywords have special meanings. When you specify them, they can be in uppercase or lowercase, but they must be used exactly as they appear in the code example. Names of database objects and their parts, such as emp and empno , appear in lowercase. However, in the text of this guide, names of database objects and their parts appear in uppercase.
Parameters act as place holders in examples.
They appear in lowercase. Parameters are usually names of schema objects, Oracle datatypes, or expressions. When you see a parameter in a syntax diagram, you should substitute an object or expression of the appropriate type. Note that parameter names appear in italics in the text of this guide. Special Text Special text is provided to alert you to particular information within the body of this guide and within other manuals.