Tableau Interview Questions and Answers
Tableau software has become a basic need for any business as it helps to understand the growth and development of the company. Tableau is a data visualization tool that allows the user to develop an interactive Dashboard.
Using Tableau software, any non-technical user can easily create and modify the dashboards. It is a well-known interactive BI software in data visualization.
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Top 60 Tableau Interview Questions and Answers
Below are Tableau interview questions and answers that can help to crack the interviews and achieve your goals.
1. What is Tableau, and what are its advantages?
Tableau is a data visualization tool that helps the user to build an interactive visualization in the form of dashboards, reports, and worksheets for enhancing their business.
- Tableau is very easy to use and user-friendly software
- Tableau helps in analyzing the data and converts data into an understandable format
- Users can merge the data with the other data to create their views and to share it with others
- Tableau helps the user to accomplish a large amount of data
- Tableau can create compound graphs easily
2. What are the types of Actions in Tableau?
There are mainly three types of actions in Tableau as given below.
- Filter actions – They enable you to utilize the information in one view to filter data in another as you make organized stories
- Highlight actions – They enable you to point out external resources
- URL actions – They enable you to point to external resources, for example, a site page, document, or another Tableau worksheet
3. List the file extension used in Tableau.
This is one of the most important Tableau interview questions. There are several file types and extensions in Tableau. Some of them are as follows-
- Tableau Workbook (.twb)
- Tableau Packaged Workbook (.twbx)
- Tableau Data source (.tds)
- Tableau Packaged Data source (.tdsx)
- Tableau Data extract (.tde)
- Tableau Bookmark (.tdm)
- Tableau Map Source (.tms)
- Tableau Preferences (.tps)
4. What do you mean by aggregation and disaggregation of data in Tableau?
When asked about aggregation and disaggregation of data in Tableau interview questions, you can reply, Aggregation and disaggregation of data in Tableau are the methods to develop a scatterplot to measure and compare the data values.
Aggregation: It is intended to proceed with a set of values that return a single numeric value. A default aggregation can be set for any amount which is not user-defined.
Disaggregation: The disaggregation of data means viewing each data source row while analyzing data both dependently and independently.
5. Define Tableau waterfall chart.
Charts are the most favorite when it comes to Tableau Interview questions. Waterfall chart in Tableau is a chart that is used to display the mutual impact of successive positive and negative values. It determines where value begins, ends, and how it increments. Along these lines, both the size of changes and the difference in costs between consecutive data points can be seen.
6. Explain about Show Me feature in Tableau.
Being a data visualization tool, Tableau makes the information analysis simple by giving several analysis systems without comprising any custom code. One of those features is Show Me feature. It is used to apply a predictable view to the current information in the worksheet.
7. What do you mean by live connections in tableau?
Live connections meaning is often asked in Tableau Interview Questions. Tableau data connectors use your current information by sending the dynamic SQL or MDX statements directly to the source database instead of importing all of the information. These indicate that you have placed resources into a fast, analytics optimized database, and you can take advantage of it by connecting live with your data.
8. How many tables can you join in Tableau?
A maximum of 32 tables can be joined in Tableau. Table size should also be limited to 255 columns.
9. Explain the term Tableau datasheet.
Tableau has a file structure that includes workbook and datasheet, like that of Microsoft Excel. A workbook comprises of the datasheet. A data-sheet can be a worksheet, a dashboard, or a story. When you interface with your data and set up the data source with Tableau, the data source links and fields show up on the left side of the workbook in the Tableau Datasheet.
10. Why is mark card used in Tableau?
The Marks card is an essential element for visual inspection in Tableau. As you drag fields to different properties in the Marks card, you add setting and detail to the marks in the view. You can use the Marks card to set the mark write and to encode your information with size, colour, text, shape, and details.
11. What different site roles can be assigned to a client in Tableau?
This question determines your soft skills in Tableau interview questions. Site roles are approval sets that are allocated to a client. Site roles can be System Administrator, Publisher, or Viewer. The site roles describe the gathering of volumes that can be approved to clients on Tableau Server. Overall site roles, which can be assigned to a client are as follows-
- Server Administrator: This role has complete access over all the servers and functionality of the website, all content on the server, and all clients.
- Site Administrator: Site Administrator has the authority to manage groups, activities, projects, workbooks and information sources for the site.
- Publisher: Publishers are allowed to sign in, interact with published views and publish dashboards to Tableau Server from the Tableau desktop.
12. Define Hierarchy in Tableau.
Hierarchy in Tableau gives drill up and drill-down functionality to the Tableau report. With the assistance of minute + and – symbols, we can explore from a more significant level to a settled level or lower level. When you interface with a data source, Tableau subsequently splits date fields into hierarchies so you can categorize them easily. You can also make your particular hierarchies.
13. Describe a Gantt chart.
A Gantt chart is an essential graphical visualization, which validates tasks or activities performed concerning time. It is also known as a visual representation of a job where the events are divided.
14. Define a Histogram chart in Tableau.
Histogram chart is the favorite topic of most of the interviewers, so it is a mandatory topic in Tableau Interview Questions. A plot that allows you to find, and illustrates, the fundamental frequency of an arrangement of continuous data is called a Histogram Chart. These help in the examination of the information for its hidden distribution, variances, smoothness, and so on.
15. What do you understand by groups in Tableau?
A group is a combination of measurement members that make a higher amount of categories. For example, if you are working with a view that displays ordinary test scores by major, you might need to group specific majors to create real categories.
16. When can we use Join and blend in Tableau?
When data is located in a single source, it is always necessary to use Joins. Whereas if your information is not in one place, blending is the most reliable way to make a left join like the association between your primary and auxiliary data sources.
17. State the difference between Stacked Bar chart and stacked column chart.
A stacked bar chart is a chart that uses bars to specify relationships between categories of data, nevertheless with the volume to break down and look at parts of an entirety. Each bar in the chart expresses to an entire, while fragments in the bar display the various components or classes.
A stacked column chart consists of multiple bars set vertically, one on another. The measurement of the bars depends on the value in the data point. Using a stacked column chart is the best way to know the variations in all the variables. This type of charts should be used when several series is higher than two.
18. Define Table Calculations.
Table Calculation is a transformation you apply to the values of a single measure in your visual, depending on measurements in the level of details.
19. What is the purpose of publishing data sources to the server?
This question tests your knowledge skills and that is why we have included it in Tableau Interview Questions. Published data sources are not so easy to use. Several item defects or design oversights could have unfulfilled the appropriation of server-based data sources. Publishing data sources to the server enable us –
- Centralize the data sources
- Share them with all the authenticated clients
- Increase uploading speed
- Plan information update with defined frequency
20. Describe a Tableau dashboard.
Tableau dashboard is a group of different views which lets you relate different types of data instantaneously. Datasheets and dashboards are connected if any modification happens to the data that directly reflects in dashboards. It is the most efficient approach to visualize the data and analyze it.
21. What are the components of the dashboard?
The dashboard comprises of five components-
- Web: It consists of a web page embedded in the dashboard
- Horizontal component: In this component, we can add objects in a horizontal layout container
- Vertical component: In this component, we can add objects in a vertical layout container
- Image Extract: It lets you upload an image to dashboard from your PC
- Text: It is a small word pad where we can format and edit the text
22. What can you do to improve dashboard execution?
- Use an extract – Extracts have the fastest approach and are a simple way to make all the workbooks run rapidly
- Reduce the scope – When you are making a visual, dashboard, or a story, it’s good to add a significant measure of data into your visualization since it’s natural to add more data fields and more sheets to the workbook. Hence, the visualization will become slower and slower to reduce.
- Use Context – Context filters improve execution as clients don’t need to make additional channels on a vast data source and thus eliminates the problem of execution time.
23. What is the difference between Tiled and Floating in Tableau Dashboards?
Tiled items are organized in a single layer grid that modifies in a measure, which is based on the total dashboard size and the objects around it. Floating items could be layered on top of other purposes and can have a permanent size and position.
Floating Layout While most questions are tiled on this dashboard, the map view and its related color legend are floating. They are layered on top of the bar graph, which utilizes a tiled layout.
24. Define Application Server.
Application Server is the server that manages content perusing, server organization and permissions for the Tableau Server web and mobile interfaces.
25. What do you understand by Gateway/Load Balancer in Tableau?
When there are some requests from the customer side, it is first detected by an external load balancer if present, and are directed to the appropriate procedure. In the absence of an external load balancer, if different methods are organized for any part, the Gateway will act as a load balancer and distribute the requests to the procedures.
26. Define parameters in Tableau.
The Tableau parameters are dynamic variables or values that substitute the constant values in data estimation and filters. The user can produce an evaluated field value that returns the value true when the condition is fulfilled, otherwise false.
27. What is the limitation of parameters of Tableau?
The parameters of Tableau are limited to be represented only in four ways on a dashboard. The settings of Tableau do not allow any further selections in a filter.
28. What is the difference between parameters and filters in Tableau?
- The fundamental difference primarily lies in the application.
- The parameters let the users input the values, which can be integers, float, date, string, which can be further used in calculations.
- The filters only accept values users select to ‘filter by’ the list, which is not useful for calculation.
- The users can dynamically modify the dimensions and measures in parameter, but filters do not support this feature.
29. Explain filters in Tableau.
Filters are the more uncomplicated and straightforward feature in Tableau. It applies to dimension or measures directly. For example, to only show Gujarat or Karnataka in a State dimension, we can use a filter on that. In Tableau, there are multiple UI options available for filters like radio buttons, drop-down lists, checkboxes, sliders, and more. Filters on sheets are also available in Tableau.
30. Distinguish between the fact table and the dimension table.
This is the decision maker Tableau Interview Questions.
- They are the assessable quantities or the numeric metrics of the data which can be examined by dimension table
- Facts are stored in the fact table containing foreign keys that distinctively refers to the related dimension tables
- The fact table is compatible with keeping the data at the atomic level and hence, it allows a significant number of records to be introduced at once.
- They are the graphics attribute values for numerous dimensions of each attribute which describe various characteristics
- A dimension table denoting a product key from the fact table can comprise of a product name, product type, color, size, and description
31. What are context filters and what are its limitations?
- Tableau helps in making the filtering process simple and easy
- It does so by forming a hierarchy of filtering, where all the other filters that are an existing reference to the context filter for all their succeeding operations
- Thus, the remaining filters will now process the data, that is already passed through the context filter
- Growth of one or more context filters helps in enlightening the performance, as the users do not have to make extra filters on the extensive data source, which reduces the query-execution time
Limitations of Context filter
- Usually, Tableau takes a bit time for placing a filter in context
- In case the filter is stored as a context, then the software generates a temporary table for that particular context filter
- This table refreshes each time and consists of all the variables and values that are not filtered by context filter
32. Explain extracts and schedules in Tableau server.
Tableau Interview questions are incomplete without this question. Original copies or subdivisions of the real data from the primary data source is called data extract. The workbooks that use the data extracts in place of using live DB connections are faster, and the extracted data is stored into the Tableau engine.
The scheduled refreshers are the scheduling tasks that are used for data extract refresh so that they get refreshed automatically when a workbook is published with data extraction.
33. Define the Line Chart and Column Chart.
A Line chart interfaces singular information points in a view. They give a primary method to imagine an arrangement of qualities and are helpful when you need to see trends after some time, or to figure future attributes. A-Line Chart is the quite popular kind of data visualization. Generally speaking, it is utilized to emphasize trends in information over equivalent time interims, for example, quarters, months, financial years, and much more.
A Column chart is a realistic graphical representation of data. Column charts show vertical bars going over the chart on a horizontal plane, axis having values are displayed on the left-hand side of the graph. Column charts and a various number of different sorts of graphs are often created in spreadsheet programs, such as Microsoft Excel or Open Office Calc. Column charts can be utilized to show an extensive range of information, for example, sales patterns, stock value changes, and precipitation amounts by year.
34. What do you mean by Page Shelf?
Tableau gives an unmistakable and powerful tool to control down the output display, which is known as Page shelf. As the name recommends, the page shelf parts the view into a series of pages, displaying an alternate perspective on each page, making it easier to understand and minimizing scrolling to analyze and see information and data.
35. What are the Filter Actions in Tableau?
Filler actions are used to transmit in-between data worksheets. Usually, filler actions send data from one location to another sheet representing related data. In the backend, filter activities send data values from the relevant source fields as filters to the target sheet.
36. Explain data visualization and its uses.
Data visualization is a presentation of data in graphical and visual form. It allows decision-makers to view analytics presented visually, for them to get a handle on challenging ideas or create new patterns. With intelligent visualization, you can make the idea a stride further by utilizing technology to draw them into diagrams and charts for more detail.
Data visualization is a fast, simple to pass on ideas universally, and you can explore different scenarios by making slight alterations. As a human being processes data by utilizing graphs or charts to have a look of complex information is quite easier rather than looking out them on spreadsheets or reports.
37. Explain the Tableau Architecture.
Tableau is exceptionally flexible, and it has a high-level customer server-based design that assists the mobile customers, web customers, and desktop installed software. Tableau desktop is approving, and publishing tools used to propose the Tableau server.
38. Define Authentication on Server.
A server that confirms authentication of a component that activates to get to a network is known as the authentication server. Such a thing can be either a human client or another server. An authentication server can reside in a PC, an Ethernet switch, an access point or a system which is retrieved by the server.
39. What is the reason behind publishing data source and workbooks?
Data sources and workbooks are published when there is a need to increase the audience for data analysis in an organization. By publishing, you can start to do the following:
- Collaborate and offer with others
- Centralize information and database driver administration
- Support portability
40. What is Viz QL in Tableau?
- Viz QL is a visual inquiry language that converts the necessary activities into data questions and after that reveals that information visually
- Viz QL carries affected gains in individuals’ capacity to see and understand information by intellectualizing the concealed difficulties of question and analysis.
- The result is an intuitive user encounter that gives people to answer questions as quickly as they can consider them
41. Explain the term LOD expression.
LOD Expressions help to calculate aggregations efficiently that are not at the level of detail of the visualization. You can then be able to synchronize those values inside visualization in random ways.
42. What is Heat Map?
Not only in Tableau Interview Questions But Heat map is also an important topic to know in all the software. The Heat map is a graphical representation of data which uses the color-coding technique to represent different values of data. As the marks heat up due to its higher cost, dark color will be shown on the map.
43. What is the story in Tableau?
The Story can be defined as a sheet which is a collection of series of worksheets and dashboards used to convey the insights of data. It can be used to show the connection between facts and outcomes that impacts the decision-making process. A story can be published to the web or can be presented to the audience.
44. What can be the reasons behind the low performance of Tableau and what are the ways to improve it?
Following are the reason for low performance
- Filters – Filters need to create an extra query, and if it used in large numbers and inefficiently then, they can reduce the performance. So, it is advised to use filters whenever it is mandatory
- Live connection – Tableau extract performs better than a live connection
- Data sources – A wrong query to an unreliable data source can reduce performance. Also, the data source’s performance can affect Tableau’s performance
Ways to improve performance-
- Make use of data extract to make workbooks run faster
- Lessen the scope of data to reduce the volume of data
- Reduce the number of marks on the view to avoid information overload
- Try to use integers or Booleans in calculations as they are much faster than strings
- Hide unused fields
- Use Context filters
- Decrease the usage of the screen and use some substitute to achieve the same result
- Use indexing in tables and use corresponding fields for filtering
- Remove unnecessary calculations and sheets
45. What are the different connection types in Tableau?
One should know about Connection types in Tableau Interview Questions There are 2 connection types available in Tableau.
- Extract: Extract is a snapshot of data which will be extracted from the data source and put into Tableau repository. This snapshot can be refreshed periodically fully or incrementally. This can be scheduled in Tableau Server.
- Live: It creates a direct connection to data source and data will be fetched directly from tables. So, data will be up to date and consistent. But this also affects access speed.
46. Explain the different Joins in Tableau.
Different joints in Tableau are as follows-
- Right Outer Join
- Left Outer Join
- Full Outer Join
- Inner Join
47. What do you understand by Data Modelling?
Data modelling is the analysis of data items that are used in a business or other situation and also used as identification of the relationships among these data items. It is a first step of doing object-oriented programming.
48. Explain the dual-axis and blended axis.
Dual Axis: Dual-axis is used to display two measures in a single graph. It allows you to compare two criteria at once. Many websites use this dual-axis to illustrate the comparisons and growth rate.
Blended Axis: Multiple measures can share in a single axis so that all the marks will be shown in a single pane. We can blend rules by dragging the 1st measure on one axis and 2nd on the real axis.
49. Describe shelves and sets in Tableau.
- Shelves: Worksheets in Tableau have shelves like columns, rows, marks, filters, pages, and so on. By placing filters on shelves, we can build our visualization structure. We can control the marks by including or excluding data.
- Sets: The sets are used to calculate a condition on which dataset will be equipped. Data will be grouped based on a situation. Fields which is responsible for grouping are known as the sets. For example – students having grades more than 70%.
50. State the difference between Bar Chart and area chart in Tableau.
Bar chart visualizes the data as a set of rectangle bars, as their values are proportional to lengths when they represent the data. The vertical axis shows the category to which they belong, and the horizontal axis shows the values. Therefore, the bar chart is an upright form of the Column chart.
The Area chart is nothing but line chat, the area between x-axis and lines will be colour or patterns. These charts are typically used to represent accumulated totals over time and are the conventional way to display stacked lines.
51. State and explain about the products offered by Tableau.
Tableau has 4 main products.
- Tableau Prep: The role of Tableau Prep is to make data for analysis. This tool offers three coordinated views which deliver us with a complete picture of data.
- Tableau Desktop: Tableau Desktop is the place where the analysis occurs. It has controlling drag and drops analytics which is very simple to use. Through Tableau desktop, you can achieve your data insights quickly.
- Tableau Online: Tableau Online is a cloud tool for protected and scalable self-service analytics. You can use it at any place, anytime and it has removed the complexities of IT.
- Tableau Server: Tableau server is used for satisfying their BI necessities. These are an on-premise resolution. This tool can take data from anywhere and share to the organization via desktop or mobile browsers.
52. How many types of filters are present in Tableau?
Filters are used to provide the correct information to viewers after removing unnecessary data. There are various types of filters available in Tableau.
- Extract Filters – Extract filters are designed to apply the filter on extracted data from the data source. In this filter, data is derived from the data source and located into the Tableau data repository.
- Data source Filters – Data source filters are the same as extract filters. They also work on the extracted dataset. But the main variance is it functions with both the live and extract connection.
- Context Filters – Context Filters are applied to the data rows before any other filters. Though they are restricted to views, they can be used on selected sheets. They define Aggregation and Disaggregation of data in Tableau
- Dimension Filters – Dimension filters are used to apply filters on dimensions in worksheets. Dimension filters are administered through the top or bottom conditions, formula and wildcard match.
- Measure Filters – Measure filters are applied to the values present in the measures.
53. Distinguish between discrete and continuous data roles.
This is the important topic in Tableau Interview Questions. Discrete data roles consist of values which are separate and distinct. Discrete data roles can take individual costs within a range. For Example – cancer patients in the hospital, no. of threads in a sheet, state. Discrete values are displayed as blue icons in the data window and blue pills on shelves. Distinct fields can be sorted.
Continuous data role comprises of any value within the limited or unlimited interval for Example – age, unit price, order quantity. Constant values displayed as green icons in the data window and green pills on shelves. Continuous fields cannot be sorted.
54. What can you do to automate reports in Tableau?
When we are publishing the reports to Tableau Server, there we will find an option to schedule report, select the time when you want to refresh the data.
55. What challenges do you face while working with huge volumes of data?
- View running will be slow
- Data Extraction
- Alignment issues with data
- Testing Data
56. What do you understand by Tableau Public?
Tableau Public topic is asked in tableau interview questions. Tableau Public is an open-source and free service which allows anyone to publish the data source and visualizations to the web. These visualizations are then implanted into blogs or web pages. They can also be distributed through email or social media. Besides, they can be allowed to download by other end users. For Tableau Public, no programming skills are needed. It can be accessed by anyone free of cost.
57. Explain concentrates and plans for Tableau server.
First duplicates or subdivisions of the real data from the data source are called as information extracts. The exercise manuals which use the data split as contrasting to utilizing live DB connections are quicker, and the removed information is foreign made into Tableau motor. After the extraction of data, the clients can allocate the exercise manuals which distribute the concentrates in Tableau server.
58. What are the functions available in Tableau?
The functions available in Tableau are Number Functions, String Functions, Date Functions, Logical Functions, Type Functions, Aggregate Functions, and Pass-through functions.
59. Which map service is used by Tableau?
Tableau uses Web Map Service (WMS) protocol. It’s a standard protocol for receiving and asking geographically referenced images.
60. Describe the Path in Tableau.
The path is one of the types of Mark. It will enable only for a line chart. The path forms based on date fields. If you want to define the path based on the measure that can be done by calling measures into the path.
Thus, we have covered the top 60 Tableau Interview Questions & Answers in the above article. This will prove like jet fuel for your career to take off! Do have a glance at Tableau Interview Questions to boost your confidence and triumph with flying colors.