If Tableau Prep detects a possible match, it highlights it in yellow. You have several options when fixing mismatched fields after a union. The star needs to be on the front of our wildcard as the Q part before the date is not a unique identifier. Tableau Prep Builder automatically created this field to display the file paths for the wildcard union you created earlier to combine tables for each year of sales orders in the southern region. In the case below we only want the sheets that contain the 21-22 data. Another note is that we can do this with the sheets within our tables. This will then return the Wimbledon data for all of the days of the week. Note that we need to include the star at the end of our wildcard, a familiar symbol for those that have used Alteryx wildcards or Regex. 4) Group and Replace Algorithms Grouping in Tableau Desktop is an operation that combines dimensions members into higher level categories. To avoid unioning in this data, we need to edit the matching pattern so that it contains familiar characters from all of the data we want. By using a Wildcard union with the specified matching pattern, Tableau Prep can identify all files that match that string condition and union them straight away. If this post resolves the question, would you be so kind to 'Select as Best'. You can exclude/include several patterns: So as you can see, above the matching pattern you can include/exclude the pattern. In this case, our folder also contains data from Clapham that we want to ignore. When using wildcard union functionality, automatically there is a new fields created File Path. If this matching pattern field is left blank, then the union will bring in all the files in that directory. Tableau Prep - Wildcard Unions by James Driver Wildcard unions have been a feature in our last two client projects, so I thought I would write some tips on how they can be used. In the example below we have the data from Monday, but we also want to bring in data from the rest of the week.īy selecting Multiple Files on our data input, we can see that pointing it to the same folder will display the other spreadsheets contained in there. The Wildcard Union will allow us to connect multiple data sources together, based around matching patterns in the data. Wildcard unions have been a feature in our last two client projects, so I thought I would write some tips on how they can be used.
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