Consider the following 1-D ARRAY data type and table.
CREATE TYPE item_price AS DECIMAL(7,2) ARRAY[20]; CREATE TABLE inventory (itemkind INTEGER, regular_price item_price, sale_price item_price);
The following query returns an element value, which is the maximum of all the element values in the regular_price array.
SELECT ARRAY_MAX(regular_price) FROM inventory;
The following is the same query using method-style syntax.
SELECT regular_price.ARRAY_MAX() FROM inventory;
The following query returns an element value, which is the maximum of the element values within the specified scope of the regular_price array.
SELECT ARRAY_MAX(regular_price, 5, 10)FROM inventory;