AVG is an aggregate function in SQL to compute the "average" of a set of values. More precisely, it computes the mean of those values. And even more precisely, AVG computes what is known as the arithmetic mean. The underlying math is so deceptively simple, it's easy to believe one understands the result and how to apply it. But keep reading! Learning about "average" is like uncovering an iceberg. There's more to it than meets the eye.
SQL Statistic Series: You are reading part of an ongoing series covering the statistical functions available in the Oracle Database implementation of SQL.