# Avgw Function

The **avgw** function returns the the weighted average of a set of
values.

The syntax of the avgw function is

avgw(x [,w])

x are the values for which the weighted average shall be calculated.

Null values are ignored.

If the number of values is zero,
the function returns null.

w are the weights. If no value is provided,
the weight is assumed to be 1.

# Example

SELECT country, avgw(price, volume) FROM sales GROUP BY country;