![]() ![]() Steps 17 & 18 to change the default aggregation to average are necessary because Tableau Prep returns the total sales value for every record on the same day.If the goal is to return the value from the previous record in the underlying data then the aggregate step is not needed. The beginning aggregate step is necessary in this example because there are multiple records per day.This means that the prep flow will have to updated to change the output. Conversely, output from a prep flow is static. Table calculations are dynamic: if is added to the Rows shelf in "Table Calculations Example" worksheet in the attached workbook, then the table calculation will automatically update to return the previous day's sale per category. Sometimes table calculations in Tableau Desktop will be the better solution.Previous to this version, LOOKUP was not available. Right-click in the right-hand data pane and select Default Properties > Aggregation > AverageĬauseThe ability to use a LOOKUP calculation in Tableau Prep is available in the product starting with version 2023.2 and newer.Output the data and connect to the output in Tableau Desktop.In the "Merge Join Fields" clean step, merge and.Add a clean step after "Join 3" and name it "Merge Join Fields".In "Join 3", Tableau should automatically join on =.Drag the "Remove Fields" clean step over the "Create Row Number" clean step and drop on "Join".In the "Remove Fields" clean step, remove the fields, , and.Create a new clean step off of the join and name it "Remove Fields".Click on the Venn Diagram to create a Left join.Drag the "Row Number + 1" clean step over the "Create Row Number" clean step and drop on "Join".Create a calculated field named "Row Number + 1" with a formula like.In the "Row Number + 1" clean step, do the following:.Create a clean step and name it "Row Number + 1".Create a calculated field named "Row Number" with a formula like.In the "Create Row Number" clean step, do the following:.Create a clean step and name it "Create Row Number".In Aggregate 1, drag Order Date to Grouped Fields and Sales to Aggregated Fields.See Aggregate and group values for detailed instructions See Connect to Data for detailed instructions ![]() Connect to Superstore in Tableau Prep.Both the workbook and the Prep flow are downloadable from the attachments section of this article. The following example uses the sample data set Superstore to find the total sales for the previous day. Use a shifted self-join to find an offset value. If using the Tableau Prep version 2023.1 or earlier, review the following workaround. See Get Previous Value for more information.Ģ. In Tableau Prep versions 2023.2+, you can now leverage a LOOKUP() calculation to reference a different row’s value for analysis. Upgrade to Tableau Prep version 2023.2 or newer. Unable to leverage the LOOKUP table calculation in Tableau Prep to reference a different row's value for analysis. ![]()
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