In the Profile pane toolbar click Create Calculated Field, or in a profile card or data grid, click the More options menu and select Create Calculated Field > Custom Calculation. The list of supported analytic calculations is shown in the Calculation editor in the Reference drop-down under Analytic.

Use the Calculation editor to create any of the supported RANK () or ROW_NUMBER() calculations. Note: ROW_NUMBER () calculations aren't available in the visual calculation editor. To create a Rank or Row_Number calculations, you can use the Calculation editor to write the calculation yourself or if you want a more guided experience, you can use the Visual Calculation editor where you select your fields and Tableau Prep writes the calculation for you. If you have duplicate rows and use this calculation, your results might change each time you run the flow if the order of rows changes. Note: In the event of a tie, Tableau Prep rounds the rank down, similar to PERCENT_RANK() in SQL.Īssigns a sequential row ID to each unique row. RANK_PERCENTILE is calculated as (Rank-1)/(Total rows-1). Rank_Modified is calculated as Rank + (Rank + Number of duplicate rows - 1).Īssigns a percentile rank from 0 to 1 in ascending or descending order to each row. If rows have the same value, they share the rank that is assigned to the last instance of the value. If rows have the same value, they share the rank that is assigned to the first instance of the value, but no rank values are skipped so you will see consecutive rank values.Īssigns a whole number rank starting with 1, in ascending or descending order to each row. The number of rows with the same rank is added when calculating the rank for the next row, so you may not get consecutive rank values.Īssigns a whole number rank starting with 1 in ascending or descending order to each row. If rows have the same value, they share the rank that is assigned to the first instance of the value. For example, if you wanted to find the total sales for each region, you could write a calculation like isn't supported.Īssigns a whole number rank starting with 1, in ascending or descending order to each row. When you need to calculate data at multiple levels of granularity in the same table, you can write a level of Detail (LOD) expression to do this. To view the available functions for Tableau Prep, review the function list in the Calculation editor. Note: Some functions supported in Tableau Desktop may not yet be supported in Tableau Prep. In version 2021.4.1 Tableau Prep Builder and on the web, you can use the tile feature to distribute rows into a specified number of buckets. If you want a more guided experience when building these types of expressions, you can use the new visual calculation editor. Starting in version 2020.1.3 Tableau Prep Builder and on the web, you can use FIXED Level of Detail (LOD) and RANK and ROW_NUMBER analytic functions to perform more complex calculations.įor example, add a FIXED LOD calculation to change the granularity of fields in your table, use the new ROW_NUMBER () analytic function to quickly find duplicate rows, or use one of the new RANK () functions to find the top N or bottom N values for a selection of rows with similar data. For general information about creating calculations, see Get Started with Calculations in Tableau (Link opens in a new window). Tableau Prep supports many of the same calculation types as Tableau Desktop. You can use calculated fields to create new data using data that already exists in your data source. For more information about authoring flows on the web, see Tableau Prep on the Web in the Tableau Server (Link opens in a new window) and Tableau Online (Link opens in a new window) help. The content in this topic applies to all platforms, unless specifically noted. Note: Starting in version 2020.4.1, you can now create and edit flows in Tableau Server and Tableau Online.

Tableau prep 2020.1