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AVG « Aggregate Functions « MySQL Tutorial
MySQL Tutorial
Aggregate Functions
AVG
16.2.AVG
16.2.1.
AVG([DISTINCT] expr): Returns the average value of expr.
16.2.2.
AVG() can work out more that one value at a time when used with a GROUP BY clause
16.2.3.
AVG() can work with other functions
16.2.4.
AVG() can work with a join
16.2.5.
AVG with NULL value