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 Remarks section below
numeric-expression The expression whose average is calculated over a set of rows.
DISTINCT clause 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.
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 returns the average product price from the Products table:
SELECT AVG( DISTINCT UnitPrice ) FROM Products;
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