Tableau Logical Functions

Tableau provides various Logical Functions to perform logical operations on our data. They are Tableau AND, NOT, OR, IF, ELSEIF, IF Else, CASE, ISNULL, IFNULL, ZN, IIF, etc. In this article, we will show you how to use Logical Functions with examples.

To demonstrate these Tableau Logical Functions, we are going to use the data present in the Global Super Store Excel Worksheet. So, Please refer to the Connecting to Excel Files and CASE article to understand the connection settings.

Table Report 1

Tableau Logical Functions

The following examples will show you the list of Logical Functions.

Tableau Logical AND Function

The Tableau AND function is used to check multiple expressions, and the syntax of the AND is as shown below:

Expression_1 AND Expression_2

As you see from the above syntax, the AND function accepts two arguments. If both the conditions are True, it returns True. Otherwise, it returns False.

To demonstrate these Tableau logical AND functions, we have to use Calculated Fields. To create a calculated field, please navigate to the Analysis Tab and select the Create Calculated Field… option.

Tableau Logical Functions 2

Once you click on the Create Calculated Field… option, the following window will be opened. Here, we renamed the default calculation name as AND Function. Please refer to the IF Statement and other articles on functions.

It will check whether the Profit is greater than 0 and the Quantity is greater than 25000. If both these conditions are true, the Tableau logical AND function will return Good; otherwise, it will return Bad.

IF(SUM([Profit]) > 0 AND SUM(Quantity) > 25000) THEN 'Good'
ELSE 'Bad'
Tableau Logical AND function 3

Let me add this AND calculated field to the table (by dragging a field to Rows Shelf). Please refer to the Create Table Report and formatting articles to understand the process of creating a table.

Tableau AND 4

Tableau Logical OR Function

The Tableau OR function is like either or statement in English. If both the conditions are False, it will return False; otherwise, it will return True. The syntax of this OR is:

Expression_1 OR Expression_2

The below statement will return Good if either of these two statements is True

IF(SUM([Profit]) > 0 OR SUM(Quantity) > 300000) THEN 'Good'
ELSE 'Bad'
Tableau Logical OR function 5

Let me add this field to the Rows shelf

Tableau OR 6

Tableau IIF Function

The IIF function is the simple version of the If Else Function. If both conditions are True, then it will return the First Statement; otherwise, the second statement. The syntax of this Tableau IIF Function is:

IIF(Expression, True_statement, False_Statement)

The following Tableau IIF function returns Profit if the condition is True. Otherwise, Loss will return.

IIF(SUM([Profit]) > 0, 'Profit', 'Loss')
Tableau IIF Function 7

Now you can see the result of the Tableau IIF function

Tableau IIF 8


The Tableau NOT function returns the exact opposite, which means, True will become false, and vice versa, and the syntax of this NOT is:


The below Not statement will return Loss if the condition is True. Otherwise, Profit will return.

IF(NOT SUM([Profit]) > 0) THEN 'Profit' 
   ELSE 'Loss'
Tableau Logical NOT function 9

You can see the NOT result by yourself

NOT 10

Tableau ISNULL Function

To demonstrate this Tableau ISNULL function, we will use the below-shown table.

Tableau Logical ISNULL Functions 11

The ISNULL function will check whether it is NULL or Not. If it is NULL, then it returns TRUE; otherwise, False will return.

The syntax of the Tableau ISNULL Function is:


The following Tableau ISNUL statement will check nulls in the Service Grade 2 column.

ISNULL([Service Grader 2])
Tableau ISNULL function 12

As you can see, this Tableau ISNULL function returned True for the products under Blue Color.

Tableau ISNULL function 13


The ZN Function will return the original values of Not Null values and 0 for Null values. In simple English, ZN in Tableau replaces the NULL values with 0.

The syntax of the Tableau logical ZN Function is:


The below logical function statement will replace NULL with 0.

ZN([Service Grader 2])
Tableau ZN Logical function 15

From the below screenshot, you can see the result of a ZN function.

Tableau ZN 16

Tableau IFNULL Function

The IFNULL function is used to replace the NULL values with your own. The syntax of the Tableau IFNULL Function is:

IFNULL(Expression, Value)

The following IFNULL statement will replace NULLs with 10 if nulls are present.

IFNULL([Service Grader 2], 10)
Tableau IFNULL function 14

Let us see the result of the Tableau IFNULL logical function.

Tableau IFNULL function 18