mysql> SELECT C.CategoryName
    -> SUM(P.UnitsInStock) AS Ilo 
    -> FROM products AS P
    -> JOIN categories AS C ON C.CategoryID=
    -> P.CategoryID GROUP BY C.CategoryName;
+----------------+-------+
| CategoryName   | Ilo |
+----------------+-------+
| Beverages      |   559 |
| Condiments     |   507 |
| Confections    |   386 |
| Dairy Products |   393 |
| Grains/Cereals |   308 |
| Meat/Poultry   |   165 |
| Produce        |   100 |
| Seafood        |   701 |
+----------------+-------+
8 rows in set (0.28 sec)
