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1. A PL/SQL construct combining variables, constants, literals, and operations on their values.
2. 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:

n   A single, literal value (for example, 10)

n   A variable or formula that contains one or more values

n   A function that returns one or more values

n   A calculation that combines values, such as variables, formulas, or functions, with arithmetic or Boolean operators