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Important Tableau Interview Questions and Answers

 Tableau   interview question and answers

1. What is Tableau?

Tableau is a business analytics and intelligence software that the stringent requirements in order to transform the way people use data to solve problems. And create interactive, suitable dashboards.

2. List out some of the new features introduced in Tableau 9.1?

The new features introduced in Tableau 9.1 includes
Data: With new web data connector, it makes data accessible from anywhere
Mobile: The new tableau comes with a high-resolution thumbnails, taking screenshot offline and high-level security for the data
Enterprise: Easy enterprise deployment with active directory synchronization
Visual Analytics: View the accessibility in the radial selection tool, also presents features like creating filter formulas and Zoom control on your data

3. What is Tableau public?

Tableau public is a free assistance that permit anyone to publish interactive data to the web. Once it is there on web, anyone can interact with the data, download it or create their own visualization.

4. Mention whether you can create relational joins in Tableau without creating a new table?

Without creating a new table, yes we can create relational joins in tableau.

5. Mention what are different Tableau files?

Different Tableau files include
Workbooks: holds many worksheets and dashboards
Bookmarks: It contains a single worksheet and it’s an easy way to share your work
Packaged Workbooks: It contains a workbook along with any supporting local file data and background images
Data Extraction Files: it is a local copy of a subset or entire data source
Data Connection Files: It’s a small XML file with different connection information

6. Mention what is the difference between published data sources and embedded data sources in Tableau?

Published data source: It include connection information that is unrestrained of any workbook and can be used by various workbooks.
Embedded data source: It include connection information are associated with a workbook.

7. Mention what are the characteristics to distinguish data source?

The characteristics of data source are:
  • Icon/Name
  • Connection Type
  • Connects to
  • Live or Last extract

    8. Mention when to use Joins vs. Blending in Tableau?

    If data occupy in a single source, it is always advisable to use Joins. When your data is not in one place blending is the most viable way to create a left join like the connection between your primary and secondary data sources.

    9. What is Tableau Data Extract?

    A data extract is a compressed summary of data stored on disk and loaded into memory as needed to render a Tableau. A TDE is a columnar store and reduce the input/output required to access and aggregate the values.

    10. What is the difference between blending and joining in Tableau?

    In joining, data from the same source are merged like, worksheet in an Excel file. In blending, it requires two completely defined data sources in your report.

    11.What is the difference between context filter to other filters?

    Whenever we crate context filter
  • Tableau will create a temporary table for this particular filter set and other filters will be apply on context filter data like cascade parameters… suppose we have crated context filter on countries >> we have chosen country as USA and India.
  • Tableau will create a temporary table for this two countries data and if you have any other filers >>other will be apply on this two countries data if we don’t have any context filter
  • Each and individual record will check for all filters

    12.What is disadvantage of context filters?

  • The context filter is not frequently changed by the user – if the filter is changed the database must recomputed and rewrite the temporary table, slowing performance.
  • When you set a dimension to context, Tableau crates a temporary table that will require a reload each time the view is initiated. For Excel, Access and text data sources, the temporary table created is in an Access table format. For SQL Server, My SQL and Oracle data sources, you must have permission to create a temporary table on your server. For multidimensional data source, or cubes, temporary tables are not crated, and context filters only defined which filters are independent and dependent.