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Chapter 46. Aggregates > Understanding Aggregate Functions

Understanding Aggregate Functions

Although you usually access a database to retrieve stored data, you often need to access calculations performed against data (and not the data itself). The SQL aggregate functions are a set of special functions that perform mathematical calculations against data, returning the results of those calculations to the calling application.

The SQL aggregate functions are both powerful and flexible, and can be used in conjunction with tables, joins, and any other database features.


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