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Tableau Software Interview Questions & Answers

Tableau Software Interview Questions & Answers


Tableau Software Interview Questions

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  • Explain What Is Tableau?

    Tableau is a business intelligence software that allows anyone to connect to respective data, and then visualize and create interactive, sharable dashboards.

  • What Is Tableau Desktop?

    Tableau Desktop is a data analysis visualization tool, 10-100 times faster than other analytic tools. Built on groundbreaking technology, Tableau desktop converts imaged data into optimized data queries and users can create interactive dashboards.

  • 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 proximity in the radial selection tool, also provides features like creating filter formulas and Zoom control on your data.

  • Explain The Importance Of Tableau?

    With instantaneous and powerful data visualization techniques, Tableau Software easily connects to any data source (Corporate Data Warehouse, Microsoft Excel or other). It supports quicker drop-and-down interface processes for creating visual reports of massive amounts of data. The best part is that all data in Tableau from various sources is created equally irrespective of the data type.

  • Explain What Is Tableau Public?

    Tableau public is a free service that allow 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.

  • Mention Whether You Can Create Relational Joins In Tableau Without Creating A New Table?

    Yes, one can create relational joins in tableau without creating a new table.

  • What Is Data Visualization?

    A much advanced, direct, precise and ordered way of viewing large volumes of data is called data visualization. It is the visual representation of data in the form of graphs and charts, especially when you can’t define it textually. You can show trends, patters and correlations through various data visualization software and tools; Tableau is one such data visualization software used by businesses and corporates.

  • Mention What Are Different Tableau Files?

    Different Tableau files include : 

    • Workbooks: Workbooks hold one or more worksheets and dashboards
    • Bookmarks: It contains a single worksheet and its an easy way to quickly share your work
    • Packaged Workbooks: It contains a workbook along with any supporting local file data and background images
    • Data Extraction Files: Extract files are a local copy of a subset or entire data source
    • Data Connection Files: It’s a small XML file with various connection information
  • List Differences Between Tableau Desktop And Tableau Server?

    While Tableau desktop performs data visualization and workbook creation, Tableau server is used to distribute these interactive workbooks and/or reports to the right audience. Users can edit and update the workbooks and dashboards online or Server but cannot create new ones. However, there are limited editing options when compared to desktop.

    Tableau Public is again a free tool consisting of Desktop and Server components accessible to anyone.

  • Mention What Is The Difference Between Published Data Sources And Embedded Data Sources In Tableau?

    The difference between published data source and embedded data source is that:

    Published data source: It contains connection information that is independent of any workbook and can be used by multiple workbooks.
    Embedded data source: It contains connection information and is associated with a workbook.

  • Define Data Modeling?

    Data Modeling in Tableau allows rapid analysis of operational data that produce visual prints of data to help users identify consumer trends, sales targets and operational improvement. Data modeling processes minimize the use of manual changes in the data structure but promote automatic adaption to the changing environment.

    It also allows real-time modeling by letting users share their analysis in the collaborative working environment.

  • Mention What Are The Characteristics To Distinguish Data Source?

    The data source are distinguished on the basis of following characteristics

    • Icon/Name
    • Connection Type
    • Connects to
    • Live or Last extract
  • Define Parameters In Tableau And Their Working.?

    Tableau parameters are dynamic variables/values that replace the constant values in data calculations and filters. For instance, you can create a calculated field value returning true when the score is greater than 80, and otherwise false. Using parameters, one can replace the constant value of 80 and control it dynamically in the formula.

  • Mention When To Use Joins Vs. Blending In Tableau?

    If data resides in a single source, it is always desirable 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.

  • List The Difference Between Parameters And Filters In Tableau?

    The difference actually lies in the application. Parameters allow users to insert their values, which can be integers, float, date, string that can be used in calculations. However, filters receive only values users choose to ‘filter by’ the list, which cannot be used to perform calculations.

    Users can dynamically change measures and dimensions in parameter but filters do not approve of this feature.

  • Explain What Is Tableau Data Extract?

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

  • Define Fact Table And Dimension Table In Tableau?

    Facts are the numeric metrics or measurable quantities of the data, which can be analyzed by dimension table. Facts are stores in Fact table that contain foreign keys referring uniquely to the associated dimension tables. The fact table supports data storage at atomic level and thus, allows more number of records to be inserted at one time. For instance, a Sales Fact table can have product key, customer key, promotion key, items sold, referring to a specific event.

    Dimensions are the descriptive attribute values for multiple dimensions of each attribute, defining multiple characteristics. A dimension table ,having reference of a product key form the fact table, can consist of product name, product type, size, color, description, etc.

  • Explain What Is The Difference Between Blending And Joining In Tableau?

    • Joining term is used when you are combining data from the same source, for example, worksheet in an Excel file or tables in Oracle database
    • While blending requires two completely defined data sources in your report.
  • What Are Quick Filters In Tableau?

    Global quick filters are a way to filter each worksheet on a dashboard until each of them contains a dimension. They are very useful for worksheets using the same data source, which sometimes proves to a disadvantage and generate slow results. Thus, parameters are more useful.

  • State Limitations Of Parameters In Tableau?

    Parameters facilitate only four ways to represent data on a dashboard (which are seven in quick filters). Further, parameters do not allow multiple selections in a filter.

  • Define Aggregation And Disaggregation Of Data In Tableau.?

    Aggregation and disaggregation in Tableau are the ways to develop a scatterplot to compare and measure data values. As the name suggests, aggregation is the calculated form of a set of values that return a single numeric value. For instance, a measure with values 1,3,5,7 returns 1. You can also set a default aggregation for any measure, which is not user-defined. Tableau supports various default aggregations for a measure like Sum, average, Median, Count and others.

    Disaggregating data refers to viewing each data source row, while analyzing data both independently and dependently.

  • Define Data Blending?

    Unlike Data Joining, Data Blending in tableau allows combining of data from different sources and platforms. For instance, you can blend data present in an Excel file with that of an Oracle DB to create a new dataset.

  • What Is Content Filter?

    The concept of context filter in Tableau makes the process of filtering smooth and straightforward. It establishes a filtering hierarchy where all other filters present refer to the context filter for their subsequent operations. The other filters now process data that has been passed through the context filter.

    Creating one or more context filters improves performance as users do not have to create extra filters on large data source, reducing the query-execution time.

    You can create by dragging a filed into ‘Filters’ tab and then, Right-Click that field and select ‘’Add to Context”

  • What Are The Limitations Of Context Filters?

    Tableau takes time to place a filter in context. When a filter is set as context one, the software creates a temporary table for that particular context filter. This table will reload each time and consists of all values that are not filtered by either Context or Custom SQL filter.

  • Name The File Extensions In Tableau.?

    There are a number of file types and extensions in Tableau:

    • Tableau Workbook (.twb)
    • Tableau Packaged Workbook (.twbx)
    • Tableau Datasource (.tds)
    • Tableau Packaged Datasource (.tdsx)
    • Tableau Data extract (.tde)
    • Tableau Bookmark (.tdm)
    • Tableau Map Source (.tms)
    • Tableau Preferences (.tps)
  • Explain The Difference Between .twb And .twbx?

    .twb is the most common file extension used in Tableau, which presents an XML format file and comprises all the information present in each dashboard and sheet like what fields are used in the views, styles and formatting applied to a sheet and dashboard.

    But this workbook does not contain any data. The Packaged workbook merges the information in a Tableau workbook with the local data available (which is not on server). .twbx serves as a zip file, which will include custom images if any. Packaged Workbook allows users to share their workbook information with other Tableau Desktop users and let them open it in Tableau Reader.

  • What Are Extracts And Schedules In Tableau Server?

    Data extracts are the first copies or subdivisions of the actual data from original data sources. The workbooks using data extracts instead of those using live DB connections are faster since the extracted data is imported in Tableau Engine.

    After this extraction of data, users can publish the workbook, which also publishes the extracts in Tableau Server. However, the workbook and extracts won’t refresh unless users apply a scheduled refresh on the extract. Scheduled Refreshes are the scheduling tasks set for data extract refresh so that they get refreshed automatically while publishing a workbook with data extract. This also removes the burden of republishing the workbook every time the concerned data gets updated.

  • Name The Components Of A Dashboard.?

    • Horizontal
    • Vertical
    • Text
    • Image Extract
    • Blank page
    • Web [URL ACTION]
  • How To View Underlying Sql Queries In Tableau?

    Viewing underlying SQL Queries in Tableau provides two options:

    Create a Performance Recording to record performance information about the main events you interact with workbook. Users can view the performance metrics in a workbook created by Tableau.

    Help> Settings and Performance> Start Performance Recording

    Help> Setting and Performance > Stop Performance Recording• Reviewing the Tableau Desktop Logs located at C:Users\My DocumentsMy Tableau Repository. For live connection to data source, you can check log.txt and tabprotosrv.txt files. For an extract, check tdeserver.txt file.

  • Define Page Shelf?

    Tableau provides a distinct and powerful tool to control the output display known as Page shelf. As the name suggests, the page shelf fragments the view into a series of pages , presenting a different view on each page, making it more user-friendly and minimizing scrolling to analyze and view data and information. You can flip through the pages using the specified controls and compare them at a common axle.

  • How To Perform Testing In Tableau?

    Performance testing is again an important part of implementing Tableau. This can be done by loading Testing Tableau Server with TabJolt, which is a “Point and Run” load generator created to perform QA. While TabJolt is not supported by Tableau directly, it has to be installed using other open source products.

  • How Many Maximum Tables You Can Join In Tableau?

    The maximum number of 32 tables can be joined in Tableau. A table size must also be limited to 255 columns (fields).

  • What Different Products Tableau Provide?

    • Tableau Server : on-premise or cloud-hosted software to access the workbooks built
    • Tableau desktop: desktop environment to create and publish standard and packaged workbooks.
    • Tableau Public: workbooks available publicly online for users to download and access the included data.
    • Tableau Reader: get a local access to open Tableau Packaged workbook
  • How Can You Display Top Five And Last Five Sales In Same View?

    Create two sets, one for top 5 another for bottom 5 and the join these two sets displaying a unique set of total 10 rows.

  • What Is Tde File?

    TDE is a Tableau desktop file that contains with a .tde extension referring to the file containing data extracted from external sources like MS Excel, MS Access or CSV file.

  • How To Use Group In Calculated Field?

    By adding the same calculation to ‘Group By’ clause in SQL query or creating a Calculated Field in the Data Window and using that field whenever you want to group the fields.

  • Can Parameters Have Dropdown List?

    Yes, parameters do have their independent dropdown lists enabling users to view the data entries available in the parameter during its creation.

  • What Is The Difference Between Quick Filter And Normal Filter?

    Normal Filter is used to restrict the data from database based on selected dimension or measure. But Quick Filters are used to give a chance to user for dynamically changing data members at run time.

  • What Is Lod Expression In Tableau?

    A syntax that supports aggregation at dimensionalities other than the view level. With level of detail expressions, you can attach one or more dimensions to any aggregate expression.

  • What Is A Format Pane In Tableau?

    A pane that contains formatting settings that control the entire worksheet, as well as individual fields in the view.

  • What Is A Extract Is Tableau?

    A saved subset of a data source that you can use to improve performance and analyze offline.

  • What Is A Data Source Page?

    A page where you can set up your data source. The Data Source page generally consists of four main areas: left pane, join area, preview area, and metadata area.

  • What Is Tableau Reader?

    Tableau Reader is a free viewing application that lets anyone read and interact with packaged workbooks created by Tableau Desktop.

  • What Is Crosstab Chart?

    It is a text table view. Use text tables to display the numbers associated with dimension members.

  • What Is A Calculated Field In Tableau?

    A new field that you create by using a formula to modify the existing fields in your data source.

  • What Is A Tableau Data Pane?

    A pane on the left side of the workbook that displays the fields of the data sources to which Tableau is connected.

  • What Is Tableau Show Me?

    Show Me is used to apply a required view to the existing data in the worksheet. Those views can be a pie chart, scatter plot or a line chart.

  • What Is A Published Data Source?

    It contains connection information that is independent of any workbook and can be used by multiple workbooks.

  • What Is A Story In Tableau?

    A story is a sheet that contains a sequence of worksheets or dashboards that work together to convey information

  • What Is Tde File In Tableau?

    It refers to the file that contains data extracted from external sources like MS Excel, MS Access or CSV file.

  • What Are Parameters And When Do You Use It?

    Parameters are dynamic values that can replace constant values in calculations.

  • What Is Import All Data Feature In Tableau?

    It Imports the entire data source into Tableau's fast data engine as an extract and saves it in the workbook.

  • What Is Connect Live?

    It Creates a direct connect to the data source and speed up access.

  • What Is Data Blending?

    Data blending is used to blend data from multiple data sources on a single worksheet. The data is joined on common dimensions.

  • What Is Table Calculation In Tableau?

    These are inbuilt calculations in tableau which we normally use to calculate Percentange chages.

  • What Are The Possible Reasons For Slow Performance In Tableau?

    More Extracts, filters and depends on data sources.

  • What Is A Page Shelf In Tableau?

    The Pages shelf is used to control the display of output by choosing the sequence of display.

  • What Is Dual Axis?

    You can compare multiple measures using dual axes, which are two independent axes that are layered on top of each other.

  • What Is A Context Filter?

    In a context filter the filter condition is applied first to the data source and then some other filters are applied only to the resulting records.

  • What Is An Alias In Tableau?

    An alternative name that you can assign to a field or to a dimension member.

  • In Tableau What Is A Worksheet?

    A sheet where you build views of your data by dragging fields onto shelves.

  • What Are Shelves In Tableau?

    They are Named areas to the left and top of the view. You build views by placing fields onto the shelves. Some shelves are available only when you select certain mark types.

  • What Is Marks Card In Tableau?

    A card to the left of the view where you can drag fields to control mark properties such as type, color, size, shape, label, tooltip, and detail.

  • What Are The Types Of Filters In Tableau?

    Custom Filters ,Context Filters, Normal Filters.

  • What Is A Tableau Workbook?

    It is a file with a .twb extension that contains one or more worksheets (and possibly also dashboards and stories).