SELECT item.itemid, SUM(transactionlines.quantity) AS total_sold FROM transaction INNER JOIN transactionlines ON transaction.id = transactionlines.transaction INNER JOIN item ON transactionlines.item = item.id WHERE transaction.type = 'SalesOrd' AND transaction.status = 'SalesOrd:B' GROUP BY item.itemid ORDER BY total_sold DESC LIMIT 10;
Identifies the top 10 best-selling items based on quantities sold (SUM(transactionlines.quantity)).
Filters billed sales orders (status = 'SalesOrd:B').
Uses LIMIT 10 to restrict results to the top 10 items.