Constant Declaration

Syntax

constant_declaration ::=

See:

• "datatype ::="

• "expression ::="

Semantics

constant

Name of the constant that you are declaring.

datatype

Data type for which a variable can be declared with an initial value.

NOT NULL

Imposes the NOT NULL constraint on the constant. For information about this constraint, see "NOT NULL Constraint".

expression

Initial value for the constant. expression must have a data type that is compatible with datatype. When constant_declaration is elaborated, the value of expression is assigned to constant.

Examples

• Example 2-12, "Constant Declarations"

• Example 2-13, "Variable and Constant Declarations with Initial Values"

Related Topics

In this chapter:

• "Collection Variable Declaration"

• "Record Variable Declaration"

• "%ROWTYPE Attribute"

• "Scalar Variable Declaration"

• "%TYPE Attribute"

In other chapters:

• "Constant Declarations"

• "Declaring Associative Array Constants"

• "Declaring Record Constants"