Oracle NVL Function Explained

2 years ago
Ava Mitchell
1 minute

The NVL function in Oracle is used to handle null values. When the first parameter is null, NVL will return the value of the second parameter; when the first parameter is not null, NVL will return the value of the first parameter. This can be used to replace null values with a specified default value in query results or to handle potential empty fields in calculations. For example:

SELECT NVL(column_name, 'default_value') FROM table_name;

This query will replace any NULL values in the column_name field of the table with ‘default_value’.

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