Consider the following 1-D ARRAY data type and table.
CREATE TYPE item_price AS DECIMAL(7,2) ARRAY; CREATE TABLE inventory (itemkind INTEGER, regular_price item_price, sale_price item_price);
When evaluating the following query, each element value of the regular_price array is added. The total sum of all the element values is then divided by the number of elements in the regular_price array.
SELECT ARRAY_AVG(regular_price) FROM inventory;
In the following query, ARRAY_AVG adds each element within the specified scope of the regular_price array. The result is a scalar value representing the total sum of adding the affected element values of regular_price divided by the total number of elements composing the specified scope.
SELECT ARRAY_AVG(regular_price, 5, 10)FROM inventory;