User's Postgres Database Schema is as follows. 
Table: invoices   
    Column: rowid, integer
    Column: quantity, integer
    Column: invoicedate, timestamp with time zone
    Column: unitprice, numeric
    Column: country, character varying
    Column: customerid, character varying
    Column: invoiceno, character varying
    Column: stockcode, character varying
    Column: description, text

To determine the product with the most sales revenue, what is the SQL query? Use some words in all caps in your response, but those all-caps words should appear at most 12 times.
user