As the name implies a
constant is a value used in a
PL/SQL Block that remains unchanged throughout the program. A constant
is a user-defined literal value. You can declare a constant and use it
instead of actual value.
For example: If you want to write a program which will increase
the salary of the employees by 25%, you can declare a constant and use
it throughout the program. Next time when you want to increase the
salary again you can change the value of the constant which will be
easier than changing the actual value throughout the program.
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