SELECT SUBSTR(product_name, 1, 15) "Product", 
       SUM(quantity) "Total Sold",
       AVG(quantity) "Average",
       COUNT(quantity) "Transactions",
       MIN(quantity) "Fewest",
       MAX(quantity) "Most"
FROM   plsql101_purchase
GROUP BY product_name
HAVING SUM(quantity) < 30;

SELECT SUBSTR(product_name, 1, 15) "Product", 
       SUM(quantity) "Total Sold",
       AVG(quantity) "Average",
       COUNT(quantity) "Transactions",
       MIN(quantity) "Fewest",
       MAX(quantity) "Most"
FROM   plsql101_purchase
GROUP BY product_name
HAVING SUM(quantity) >= 100;