Explain the Logical Function ' IFNULL' in Tableau with Example?

In Tableau, the "IFNULL" logical function is used to handle null values in a dataset by providing an alternative value or action when encountering nulls. It allows you to replace null values with a specified value or perform a specific action when nulls are encountered.

The syntax of the "IFNULL" function in Tableau is as follows:

IFNULL(expression, value_if_null)

Here's an example to illustrate how the "IFNULL" function works in Tableau:

Suppose you have a dataset of employees and their sales targets, but some employees have missing or null sales target values. You want to display the sales target values, replacing the nulls with 'N/A' for better clarity.

IFNULL([Sales Target], 'N/A')

In this example, the "IFNULL" function checks the expression [Sales Target] for null values. If the [Sales Target] is null, it replaces the null value with the specified value 'N/A'. If the [Sales Target] is not null, it simply returns the original [Sales Target] value.

For instance, if an employee has a sales target of $100,000, the "IFNULL" function will return $100,000 as the sales target value. However, if another employee has a null sales target, the "IFNULL" function will replace the null value with 'N/A'.

The "IFNULL" function is useful for handling null values in Tableau calculations, visualizations, and data analysis. It allows you to control the behavior of nulls by replacing them with alternative values or performing specific actions when nulls are encountered. By using the "IFNULL" function, you can ensure that your data is presented or processed appropriately, even in the presence of null values.