abstract base class
A class that defines the requirements and behavior of descendant classes by specifying methods and variables. An abstract base class does not support the creation of instances.
class, descendant class, method, variable
A technique that reduces duplication of program code. Abstraction provides a framework for related classes in an object-oriented system.
class, object-oriented programming
A function that performs a calculation over a set of data rows. For example, SUM calculates the sum of values of a specified numeric field over a set of data rows. Examples of aggregate functions include AVERAGE, COUNT, MAX, MIN, and SUM.
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