The NVL function lets you substitutes a non-value when a null value is encountered. The syntax for the NVL function is: NVL ( string1, replace_with ) string1 is the string to test for a null value. replace_with is the value returned if string1 is null. Example #1: select NVL (supplier_city, 'n/a')
from suppliers; The SQL statement above would return 'n/a' if the supplier_city field contained a null value. Otherwise, it would return the supplier_city value. Example #2: select supplier_id,
NVL (supplier_desc, supplier_name)
from suppliers; This SQL statement would return the supplier_name field if the supplier_desc contained a null value. Otherwise, it would return the supplier_desc . Example #3: select NVL (commission, 0)
from sales; This SQL statement would return 0 if the commission field contained a null value. Otherwise, it would return the commission field.
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