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

Syntax 1

AVG( numeric-expression | DISTINCT numeric-expression )

Syntax 2

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

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

Parameters

Returns

Returns the NULL value for a group containing no rows.

Returns DOUBLE if the argument is DOUBLE, otherwise NUMERIC.

Remarks

This average does not include rows where the numeric-expression is the NULL value.

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.

See also

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

Standards and compatibility

Example

The following statement returns the value 49988.623200.

SELECT AVG( Salary ) FROM Employees;

The following statement returns the average product price from the Products table:

SELECT AVG( DISTINCT UnitPrice ) FROM Products;