Look at the following "Products" table:
| P_Id | ProductName | UnitPrice | UnitsInStock | UnitsOnOrder |
|---|---|---|---|---|
| 1 | Jarlsberg | 10.45 | 16 | 15 |
| 2 | Mascarpone | 32.56 | 23 | |
| 3 | Gorgonzola | 15.67 | 9 | 20 |
Suppose that the "UnitsOnOrder" column is optional, and may contain NULL values.
Look at the following SELECT statement:
SELECT ProductName, UnitPrice * (UnitsInStock + UnitsOnOrder)
FROM Products;
FROM Products;
In the example above, if any of the "UnitsOnOrder" values are NULL, the result will be NULL.
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