Interview process can be a bit overwhelming. You tend to get nervous and feel all kinds of emotions before finally heading to the interviewer’s room. However, you don’t have to worry about a thing if you are well prepared for it. That is why, we are here to boost your confidence and knowledge with these amazing and super helpful interview questions on Tableau.
Reporting has become a very necessary element of an enterprise. This is because a business report is a very important document that discloses some specific information about a business enterprise. It is usually written to attract the investors to the organization who is preparing the report. Moreover, the purpose of a good business report is to have your workers well-informed about the company's goal lines and accomplishments so far.
Tableau is a reporting tool that has revolutionized the world of business reporting. Reporting has never been easier before, thanks to Tableau. This is the reason why more and more companies are heading towards adopting this amazing tool to achieve the purposes of a good business report. This adoption of Tableau has created a lot of job openings within the companies that require skilled Tableau professionals to fill these vacancies. This has left a lot of scope for tableau questions to be answered by these aspiring Tableau professionals.
If you are aspiring for a job in the field of Tableau, then you will have to face a job interview for the same. We have compiled a list of the most commonly asked tableau interview questions and answers that will really help you with your interview.
For any Tableau enthusiast who is likely to attend an interview session on Tableau anytime soon, here are some of the most popular Tableau interview questions and answers that may be asked to you. We have tried our best to include the most frequently asked Tableau questions like Tableau server interview questions, Tableau developer interview questions and Tableau admin interview question, along with their answers to help freshers and the experienced professionals of the industry with their job interview.
Q1). What is Tableau?
Tableau is a Business Intelligence tool for visually analyzing data. Users can create and distribute an interactive and shareable dashboard depicting trends, variations, and density of data in the form of graphs and charts. Tableau can connect to files, relational and Big Data sources to acquire and process data; allowing data blending and real-time collaboration.
Q2). What are the various data types in Tableau?
Tableau supports the following data-types:
|Date||August 5, 2018|
|Date & Time||August 5, 2018 05:15:00 PM|
|Geographical Values||New York|
|Text / String||Hello|
Note: Left hand side of the image shows the data-types and the right-hand side image display the examples of the same
Q3). Name a few Tableau Products?
Here is a list of a few Tableau Products that you should have an extensive knowledge about as these are the most essential and frequently asked Tableau Interview Questions -
Q4). What is the latest version of Tableau that is available in the market?
The most recent version of Tableau that is available is the Tableau Desktop Version 2018.2.2.
Q5). What is data visualization?
It is the most important Tableau Developer interview question and comes up in almost every Tableau interview. If you have basic to intermediate knowledge of Tableau, then you should be able to answer this one.
Data Visualization refers to the graphical representation of information and data. Data Visualization uses Statistical graphics, plots, information graphics, and other tools. Numerical data may be encoded using dots, lines, or bars, to visually communicate a quantitative message. Patterns, trends, and correlations that might go undetected in text-based data can be exposed and recognized easier with data Visualization software.
Q6). Why should you use Tableau?
Tableau helps people see and understand their data. You can work with all kinds of data and across disparate data sets (on-premise database, a database, a data warehouse, a cloud application or an Excel files). Tableau lets you create rich visualizations and dashboards from the data in minutes connecting any data, anytime and anywhere, regardless of its size and complexity or mix of unstructured and structured data.
Q7). What are Filters in Tableau?
Filter allows you to view specific datasets while hiding unneeded data in a Tableau workbook, dashboard, or view.
Q8). How many types of filters are there in Tableau?
There are three Types of filters in tableau. Read about them in detail since you are likely to face these kinds of interview questions for Tableau.
Q9). How to remove the All options from a Tableau auto – filter?
Follow these steps to remove all options from a Tableau auto-filter
Q10). Elucidate the benefit of a Tableau extract file over the live connection?
Extracts allow you to work without an active connection to the data source, improving performance as well as allowing you to take advantage of Tableau functionality not available or supported in your original data. Especially when working with large data sets, creating and working with extracts can be faster than working with the original data.
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Q11). What is the maximum number of tables that we can join in Tableau?
The maximum number of tables that can be joined in Tableau is 32
Q12). What do you understand by Dimensions and Facts?
Dimensions are those fields which contain data that cannot be aggregated, such as descriptive text columns. Facts are those fields that can be measured, aggregated, or used for mathematical operations i.e. numerical values.
Q13). Explain the difference between heat map and tree map?
Heat map is a representation of data in the form of a map or diagram in which data values are represented as colored blobs of various sizes. Heat maps provide an immediate visual summary of information and allow the viewer to understand complex data sets easily.
Tree maps provide a hierarchical view of your data. In tableau tree, maps display data in nested rectangles that can legibly display thousands of items on the screen simultaneously.
Q14). What is the difference between twb and twbx file extensions in Tableau?
A .twb file contains Tableau's instructions for interacting with the data sources. It is an xml document that describes the visualizations that Tableau generates. A live connection to the data source is required when working with .twb files. A .twbx file is a Tableau Packaged Workbook containing the original .twb file and data source(s) in one package. When using a .twbx file analysis can be performed without network/internet connections to your data.
Q15). What is a blended axis?
Measures can share a single axis so that all the marks are shown in a single pane, this case is called a blended axis. It allows you to compare two or more measure values against the same axis. To make a blended axis drag a new measure onto already existing axis.
Q16). Do you think that you can get values from two different sources as one single input into a parameter in Tableau?
No, this feature or process is currently not supported in the tableau.
Q17). In how many ways can we use parameters in Tableau?
Parameters can be used with filters, calculated fields, actions, measure-swaps, changing views and auto updates.
Q18). What is the use of new Custom SQL Query in tableau?
Custom SQL Queries can be used to pull data in a structured manner as needed. Instead of having to import entire tables we can use SQL queries to obtain only required columns/rows, increasing performance.
Q19). What is Tableau Data Server?
A Tableau Data Server is a secure, centrally managed and standardized repository for your dataset. It allows you to upload and share data extracts, preserve database connections, as well as reuse calculations and field metadata, serving as a facilitator between Tableau users and the data. Making it easy for any changes you make to the data-set, calculated fields, parameters, aliases, or definitions, to be saved and shared with others. It also increases performance by using server’s resources to run queries on extracts without having to first transfer them to your local machine.
Q20). What is Tableau Data Engine?
Tableau Data Engine is an analytical database designed to achieve instant query response. It provides predictive performance and integrates seamlessly into existing data infrastructures. Tableau Data Engine is not limited to load entire data sets into memory.
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Q21). What is the difference between joining and blending in Tableau?
Joining is a method for combining the related data on common fields from the same source. The result of combining data using a join is a virtual table that is typically extended horizontally by adding columns of data.
Data blending is a method for combining data that supplements a table of data from one data source with columns of data from another data source.
Q22). How to do Performance Testing in Tableau?
Performance testing of tableau can be done by using TabJolt, which is a “point-and-run” load and performance testing tool specifically designed to work easily with Tableau Server 9.0 or later. TabJolt can automatically load and interact with Tableau visualizations published on Tableau Server. All you need to do is configure TabJolt and point it to the correct server instance and workload. TabJolt simulates virtual users based on your configuration settings, and measures various metrics. It records those metrics in a Postgres database where you can maintain a history of your tests.
Q23). How to add Custom Color to Tableau?
Follow the given steps to add a custom color to Tableau-
In the Preferences.tps file, between the "preferences" tags, paste the following
<color-palette name="My Categorical Palette" type="regular" > <color>#eb912b</color> <color>#7099a5</color> <color>#c71f34</color> <color>#1d437d</color> <color>#e8762b</color> <color>#5b6591</color> <color>#59879b</color> </color-palette>
Save the Preferences.tps file and then restart Tableau Desktop.
Open a data source.
From the Dimensions pane, drag a discrete dimension, such as Region, to Color. Click the color.
legend menu arrow and select Edit Colors.
In the Edit Colors dialog box, from the palette drop-down list, select your new custom palette.
Click the Assign Palette button to assign the custom colors to each respective field. Click OK.
Q24). How to automate reports in Tableau?
When publishing reports to Tableau Server, select the option to schedule reports. The report will be refreshed and automatically generated as per the selected schedule/interval.
Did our list of complied interview questions for Tableau helped you? You will also find many questions on the internet if you carry out a search like “interview questions Tableau” or “interview questions on Tableau”. However, this blog contained all the necessary interview questions on Tableau that will definitely help you land a job of your choice, if you prepare well. Sign up for our specially designed Tableau course to improve your skills even more!
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