AVG

Compatibility

AVG(f)
Engine	OK	Alternative
ingres	Yes
mysql	Yes
oracle	Yes
postgres	Yes
sqlserver	Yes

AVG

AVG gives the average (the mean) of a whole column or a group of rows for a single column of values.

AVG is an aggregate function it is normally used with GROUP BY.

The mean of the values 2, 5, 5 is (2+5+5)/3 = 12/3 = 4, you divide by 3 because there are 3 numbers in this example.

NULL values do not contribute to the calculation.

    SELECT region, AVG(population)
    FROM bbc
   GROUP BY region 

With a GROUP BY region statement each region shows up just once. The AVG column gives the average population per country for each region.

SELECT region, AVG(population)
  FROM bbc
 GROUP BY region

See also

• MAX function
• COUNT function
• MIN function

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