Following is a must-have list of Tableau Interview Questions with detailed answers and core concepts. If you prepare the following Tableau Interview Questions well, you’ll feel more comfortable in a Tableau Interview. We’ll highly recommend improving your practical skills as well. Follow here for What is Tableau career guide. Also getting certified in tableau increases your skills and chances to land your dream job.
A tableau is a tool that is helpful in visualization and it gives immense strength to business users to make the right decision based on data analysis.
Following are the main products of Tableau:
Tableau Desktop: It is a development tool which helps to visualize the data. It is so much powerful that you can get the insight of the data in a few minutes.
Tableau Prep: It is comprised of the following two products. Once is Tableau Prep Builder which is used for building your data flows. Whereas Tableau Prep Conductor is mainly for making schedules, monitoring flows along with managing flows across your organization.
Tableau Online: It is an analytics platform hosted in the cloud. It allows you to publish dashboards and share your discoveries with anyone online. Using this platform you can invite your colleagues or your customers to explore and interact with data and see visualization developed in Tableau.
Tableau Server: It is Tableau server which allows you to publish your dashboards through Tableau Desktop and share them throughout your organization.
If you’re interested in getting tableau certification, feel free to check out all tableau certification-related material including tableau certification dumps, free quizzes and complete certification practice exams on tableau desktop as well as the server. If you feel, you need to improve your skills, you can take FREE Online Tableau Training as well.
Tableau uses a different type of files in order to provide business answers. Following is a list of the available file type in the Tableau
The published data source is available to other users which they can use in the development of other workbooks and dashboard.
The embedded data source is a data source used in a workbook and cannot be used by any other workbook.
The default location of Tableau extracts is the location pointed to by the system’s %TEMP%
environment variable for all temporary files used in the process of creating extracts.
Tableau Server uses the folder :\ProgramData\Tableau\Tableau Server\data\tabsvc\temp.
Tableau splits the data into two major types: dimensions and measures. Dimensions are usually those fields that cannot be aggregated; measures, as its name suggests, are those fields that can be measured, aggregated, or used for mathematical operations.
Example of dimension are
• City
• Grade
• Country
Example of Measure are
• Sales
• Profit
• No of Students in a class
When you add a measure to the view, Tableau automatically aggregates its values. Sum, average and median are common aggregations.
Default aggregation method is SUM().
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One of the main features is data blending in Tableau. When there are multiple data sources which you need to analyze together in a single view, you can go ahead with data blending option. For example, suppose the data of sales exist in a relational database whereas Sales Target figures are in an Excel file. You can blend both data sources to give a combined view.
When we have data between two or more tables or sheets which exists within the same Data Source, we can use the data joining technique to the single view. Example: Combining two tables from the same SQL Server database.
All filters that you set in Tableau are computed independently by default.
It is the default behaviour that filters placed in Tableau are computed independently That is, each filter accesses all rows in your data source without regard to other filters.
However, there is an option using which you can set one or more categorical filters as context filters in the view.
Context filter can be regarded as an independent filter. Any other filters that you set, process only the data that passes through the context filter which makes them dependent filters.
You may create a context filter for any of the following reason:
It is true because Tableau Forecasts are computed using exponential smoothing.
A tableau is an amazing tool for Data Visualization. Preparing above given Tableau interview questions will be helpful in any level of Tableau Interview.
There are two ways through which you can implement security in the Tableau.
You can maintain user security through the database . Following are high-level steps to achieve security at database level
As a result of Tableau Server upgrade, existing Tableau desktop developers does not necessarily upgrade in order to publish the workbooks. When they will try to publish, they will receive a warning but workbook will be published successfully in the Tableau Server.
It can be analyzed by going through the business requirement for that extract to do a complete refresh or incremental refresh.
Extracts can be configured to refresh on an incremental basis. This way extract refresh, will bring the delta of changes in the data and will refresh much faster and in a shorter time.
All extracts jobs are submitted depending on the priority defined while creating the extracts. The default priority is 50. In case you want to make sure that extract gets refreshed on priority, you can set this priority number to a lower number. Lower the priority number, earlier it will be picked to refresh. This priority number ranges from 0 to 100. 0 being the highest priority.
For the above-mentioned scenario, priority number can be modified so that the CEO should see the latest data after 7 AM.
Performance recorder can be used to identify the areas which are a candidate to optimize. Performance recorder gives you a complete timeline for loading and executing events and all other calculations which takes time. This gives you immense control and awareness to know about the load time and time delaying areas.
As per Tableau provided guideline following points should be considered in Tableau Dashboards development.
Permission can be controlled on the Workbooks level or the Project level. Tableau provides an option where you can configure the permission at the project level and lock the permission to be set at the workbook level. In this way whatever setting you set at the project level, will supersede the permissions at workbook level. It is very useful when you want to apply project level permission policies.
For above-mentioned requirement, you can create One Site and it can have multiple projects. One project for each line of business like Finance, HR etc. and apply permission at project level according to business requirements.
Tableau provides a subscription option where users can subscribe to have an email alert to get the dashboard. Tableau Server Admin can also subscribe any dashboard on behalf of any user (who does not have subscribe option enabled for his/ her user).
While sending the dashboard email alert, Tableau takes care of security and only relevant data is shared in email alerts.
Tableau Server provides an option to rename the published tableau workbooks. In order to rename the dashboard from ‘Sales Dashboard’ to ‘Sales Executive Dashboard’, you don’t need to re-publish, you can simply rename the workbook.
When we publish a workbook on Tableau server, there is a permission option that can be configured to control the access options for users.
If the filter option is disabled, filters are not available to users. In order to fix this, you can either publish the workbook again selecting the filter option for the users or permissions can be set through server administrator for a published workbook.
Yes, multiple versions of Tableau Desktop can exist on the same development machine enabling the developer to work for various versions of Tableau at the same time.
Syed Farhan Ashraf is an expert professional working for enterprise BI solutions and helping his clients in managing large scale projects. He has expertise in data integrations, developing dashboards using Tableau, Python and other data visualization and analysis tools. An active member of the Tableau community in providing training and guidance to newbies.
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