Both the ZN and IFNULL functions in Tableau can be used to replace NULL values with zeros. The ZN function converts NULL to zero directly, while the IFNULL function allows you to specify that NULL should be replaced with zero. Both will result in showing zero for any NULL values in the Profits field. References: https://help.tableau.com/current/pro/desktop/en-us/functions_functions_logical.htm#IFNULL https://help.tableau.com/current/pro/desktop/en-us/functions_functions_logical.htm#IF https://help.tableau. com/current/pro/desktop/en-us/functions_functions_logical.htm#ZN https://help.tableau.com/current/pro /desktop/en-us/functions_functions_logical.htm#ISNULL