Dealing with nulls in Tableau calculations requires a bit of specialized product knowledge. For instance you can’t write IF [Dimension] = NULL THEN “X” END. If you want to reference a null value, you need to use ISNULL. If you want to replace a null value with another value, you can use IFNULL. If you want to replace all nulls with zero, you can use ZN. This videos shows you how these functions work and which use cases they are most helpful for.
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