1. A PL/SQL construct combining variables, constants, literals, and
operations on their values.
2. (Oracle Express) One or more data values that are specified in an Express
language program. For example, you can specify expressions as arguments
to programs or functions. An expression can be any of the following:
A calculation that combines values, such as variables, formulas, or functions, with arithmetic or Boolean operators
Copyright © 1984, 2005, Oracle. All rights reserved.