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AVG function [Aggregate]

Computes the average, for a set of rows, of a numeric expression or of a set unique values.

AVG( numeric-expression | DISTINCT numeric-expression )

AVG( numeric-expression ) OVER ( window-spec )

window-spec : see Syntax 2 instructions in the Usage section below

numeric-expression    The expression whose average is calculated over a set of rows.

DISTINCT numeric-expression    Computes the average of the unique numeric values in the input.

This average does not include rows where the numeric-expression is the NULL value. Returns the NULL value for a group containing no rows.

Syntax 2 represents usage as a window function in a SELECT statement. As such, elements of window-spec can be specified either in the function syntax (inline), or in conjunction with a WINDOW clause in the SELECT statement. See the window-spec definition provided in WINDOW clause.

For more information about using window functions in SELECT statements, including working examples, see Window functions.

• SUM function [Aggregate]
• COUNT function [Aggregate]

• SQL/2003    Core feature. Syntax 2 is feature T611.

The following statement returns the value 49988.623200.

SELECT AVG( Salary ) FROM Employees ;

The following statement could be used to determine the average based on unique prices in the production list:

SELECT AVG( DISTINCT ListPrice ) FROM Production ;