Top 50 Tableau Real Time Interview Questions And Answers Pdf
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Meanwhile this Tableau interview questions blog, I have accomplished the common frequently asked questions by interviewers. Certain questions are obtained after interviewing by top business masters in the field of Data analytics and visualization. If you desire to brush up on the Tableau Course basics, which I suggest you do before proceeding ahead with this Tableau Interview Questions, take a glance at this blog.
Tableau Real Time Interview Questions:
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1. What is a blended axis?
Answer: Multiple Measures are shown in single-axis and also all the marks shown in a single pane(Selenium Training )
Drag a dimension in a column
Drag the first measure in column
Drag 2nd measure in existing axis
2. What makes Tableau software stand out?
Answer: In my view, Tableau stands out for several reasons:
First, most of the BI tools out there are pricey. However, Tableau has a free offering (Tableau Public) as well as a very popular (also free) academic distribution. Tableau is well recognized by firms like Forrester research to be one of the easiest to use, and agile products currently available. see here: Tableau Ranks #1 in The Forrester Wave: Advanced Data Visualization (ADV) Platforms That makes it easy to pick up and try new things with, which data visualization people love about it.(Sap Fico Online Training )
On the other hand, unlike some of the other BI tools, Tableau is not a complete technology stack, it is most useful for visualization and analytics. – you will need other products in addition to the tableau for heavier enterprise data ETL, maintenance, and storage, etc.
3. How do we do testing in Tableau?
Answer: You can’t test in Tableau as far as I know. It is a data visualization software.
4. Can you get values from two different sources as a single input into parameter?
Answer: Tableau currently not support the multi-valued parameters… “Case Study: The “dynamic parameter with a blend” technique can be used to highlight a single value, but not multiple values because of the way it works. As Tableau parameters are not dynamic, we cannot “filter” the list of values at runtime.”
5. How many ways do we use parameters in Tableau?
Answer: We can use parameters with filters, calculated fields, actions, measure-swap, changing views and auto-updates.
6. What is the difference between Tableau and Traditional BI Tools?
Answer: Following are the difference between Tableau and Traditional BI Tools:
Tableau provides easy to use, best in class, visual analytic capabilities but has nothing to do with the data foundation or plumbing. But with an integration with a SQL server, it can be the complete package.
On the other hand, traditional BI tools have the mentioned capabilities but then you have to deal with a significant amount of upfront costs. The cost of consulting, software and hardware is comparatively quite high.
7. What are the different filters in Tableau and how are they different from each other?
Answer: In Tableau, filters are used to restrict the data from the database.
The different filters in Tableau are: Quick, Context and Normal/Traditional filter are:
Normal Filter is used to restricting the data from database based on selected dimension or measure. A Traditional Filter can be created by simply dragging a field onto the ‘Filters’ shelf.
Quick filter is used to view the filtering options and filter each worksheet on a dashboard while changing the values dynamically (within the range defined) during the run time.
Context Filter is used to filtering the data that is transferred to each individual worksheet. When a worksheet queries the data source, it creates a temporary, flat table that is used to compute the chart. This temporary table includes all values that are not filtered out by either the Custom SQL or the Context Filter. ( oracle apex training )
8. What are Extracts and Schedules in Tableau server?
Answer: 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.
9. How to do Performance Testing in Tableau?
Answer: 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. ( puppet training )
10. What is the difference between Data blending and join?
Answer: Joining is a SQL term that refers to combining two data sources into a single data source. Blending is a Tableau term that refers to combining two data sources into a single chart. The main difference between them is that a join is done once at the data source and used for every chart, while a blend is done individually for each chart. Top 50 Tableau Real Time Interview Questions And Answers Pdf
11. What is the order of execution of table calculation, LOD, reference lines?
- Order of execution
- Table Calculations
- Reference lines
12. What is the use of a new Custom SQL Query in tableau?
Answer: Custom SQL Query written after connecting to data for pulling the data in a structured view, One simple example is you have 50 columns in a table, but we need just 10 columns only. So instead of taking 50 columns, you can write a sql query. The performance will increase.
13. What are the differences between Tableau Software and Traditional BI tools?
Answer: Tableau provides easy to use, best in class, Visual Analytic capabilities, but it does not help with the plumbing (data foundation). You could, for example, marry SQL Server with Tableau to get the complete package. Tableau licenses are relatively expensive if you are looking to scale.
14. How can we combine database and flat file data in tableau desktop?
Answer: Connect data two times, one for database tables and one for the flat file. The Data-> Edit Relationships
Give a join condition on the common column from DB tables to flat file
15. What Does TABLEAU do?
Answer: Our goal is to help people see and understand data. Our software products put the power of data into the hands of everyday people, allowing a broad population of business users to engage with their data, ask questions, solve problems and create value.(Azure Training )
16. What is data modeling?
Answer: Data modeling is the analysis of data objects that are used in a business or other context and the identification of the relationships among these data objects. Data modeling is the first step in doing object-oriented programming.
17. What is your daily work process in tableau?
Answer: I think we all work on different projects using Tableau, so the work begins from understanding the requirement getting the required data, storyboarding then creating visualizations in Tableau and then presenting it to the client for review.
18. What is a parameter in Tableau? And how it works?
Answer: Parameters are dynamic values that can replace constant values in calculations and can serve as filters.
19. How does Tableau perform with huge datasets?
Answer: Tableau Performance is based on Data source performance. If data source takes more time to execute a query then Tableau must wait up to that time.
20. Define the names for parameters, filters, etc…?
Answer: Parameters are dynamic values that can replace constant values in calculations and can serve as filters. Filters are used to restrict the data based on the condition u have mentioned in the filters shelf.(Sql Server Training )
21. What are the major differences between tableau version 7.0 and tableau version 8.0?
1. New visualizations are introduced like treemap, bubble chart and box, and whisker plot
2. We can copy worksheet directly from one workbook to another workbook
3. Introduced R script
22. How to create filled maps?
Step 1: Build a Map View Double-click a geographic field such as State, Area Code, Zip Code, etc.
Step 2: Select the Fille Map Mark Type The Automatic mark type will show this type of view as circles over a map. On the Marks card, select Filled Map to color the geographic areas.
Step 3: Drag a Field to the Color Shelf Define how the locations are colored by dragging another field to the Color shelf.
23. Is Parameter have its dropdown list?
Answer: Yes, it may have its own drop-down list, the entries which you make in the Parameter while creating it can be viewed as a Dropdown list.
24. Suppose my license expires today, can users able to view the dashboards or workbook which I published in server earlier?
Answer: If your server license expires today, your user name on the server will have the role ‘unlicensed’ which means you cannot access, but others can. The Site Admin can ‘Change Ownership’ to another person, so extracts, if enabled, do not fail. ( big data online training )
25. Think that I am using Tableau desktop and have a live connection to Cloud era Hadoop data. I need to press F5 to refresh the visualization. Is there any way to automatically refresh the visualization every x minutes instead of pressing F5 every-time?
Answer: Here is the example of the refreshing dashboard in every 3 seconds, Replace API src and server URL with yours. The interval below is for 3 seconds.
26. What Tableau Desktop is?
Answer: Tableau Desktop is based on breakthrough technology from Stanford University that lets you drag & drop to analyze data. It is a great data visualization tool, you can connect to data in a few clicks, then visualize and create interactive dashboards with a few more.
27. What are the differences between Tableau Software, GoodData and Traditional BI (Business Objects, etc.)?
Answer: You could talk feature – functionality for days, but at a high level, there are four major differences.
1. Speed: How fast can you get up and running with the system, answer questions, design and share dashboards and then change them? This is Where systems like Tableau and GoodData are far better than old – school business intelligence like Business Objects or Cognos. Traditional systems took months or years to intelligence like Business Objects or Cognos. Traditional systems took months or years to implement, with costs running to millions. Tableau has a free trial that installs in minutes and GoodData is cloud-based, so they are faster to implement by orders of magnitude. They are also faster to results: traditional BI requires IT and developers to make any changes to reports, so business users are stuck in a queue waiting to get anything done. Tableau and GoodData provide more of a self – service experience.
2. Analysis layer: This is where Tableau excels. It has a powerful and flexible drag & drops visualization engine based on some technology from Stanford. GoodData and traditional BI typically provide some canned reports but changing them require significant time and money.
3. Data layer: This is where the three options are most different:
GoodData requires you to move your data to its cloud. Traditional BI typically requires you to move your data to its data warehouse system. Tableau connects to a variety of existing data source and also provides a fast in-memory data engine, essentially a local database. Since most enterprises have their data stored all over the place, this provides the most choice and lets companies use the investment they’ve already made.
4. Enterprise readiness: Traditional BI and Tableau do well here, with enterprise-level security and high scalability.
28. What is the difference between the quick filter and Normal filter in tableau?
Answer: Quick filter is used to view the filtering options and can be used to select the option. Normal filer is something you can limit the options from the list or use some conditions to limit the data by field or value.
29. How do I automate reports using Tableau software?
Answer: You need to publish the report to tableau server while publishing you will find one option to schedule reports. You just need to select the time when you want to refresh data.
30. How is Tableau so fast when working with databases?
Answer: Tableau compiles the elements of your visual canvas into a SQL or MDX query for the remote database to process. Since a database typically runs on more powerful hardware than the laptops/workstations used by analysts, you should generally expect the database to handle queries much faster than most in-memory BI applications limited by end-user hardware. Tableau’s ability to push computation (queries) close to the data is increasingly important for large data sets, which may reside on a fast cluster and may be too large to bring in memory. Another factor in performance relates to data transfer, or in Tableau’s case resultset transfer. Since Tableau visualizations are designed for human consumption, they are tailored to the capabilities and limits of the human perception system. This generally means that the amount of data in a query result set is small relative to the size of the underlying data, and visualizations focus on aggregation and filtering to identify trends and outliers. The small result sets require little network bandwidth, so Tableau is able to fetch and render the result set very quickly. And, as Ross mentioned, Tableau will cache query results for fast reuse. The last factor involves Tableau’s ability to use in-memory acceleration as needed (for example, when working with very slow databases, text files, etc.). Tableau’s Data Engine uses memory-mapped I/O, so while it takes advantage of in-memory acceleration it can easily work with large data sets which cannot fit in (Servicenow Training )memory. The Data Engine will work only with the subsets of data on disk which are needed for a given query, and the data subsets are mapped into memory as needed.
31. Explain the features of Tableau 8.3?
With Kerberos support, Tableau 8.3 advances enterprise-grade data analysis with these enhancements:
1. Provides seamless, single sign-on experience from Tableau client to back-end data sources
2. Protects sensitive data with delegated access and viewer credential management
3. Connects to live data sources through stable, automated back-end authentication
4. Leverages existing IT investments in enterprise-grade authentication and data security
5. Supports smart card authentication
32. What are the sets?
Answer: Sets are custom fields that define a subset of data based on some conditions. A set can be based on a computed condition, for example, a set may contain customers with sales over a certain threshold. Computed sets update as your data changes. Alternatively, a set can be based on a specific data point in your view.
33. What are groups?
Answer: A group is a combination of dimension members that make higher-level categories. For example, if you are working with a view that shows average test scores by major, you may want to group certain majors together to create major categories.
34. What is a hierarchical field?
Answer: A hierarchical field in the tableau is used for drilling down data. It means viewing your data at a more granular level.
35. What is the Tableau Data Server?
Answer: Tableau server acts as a middle man between Tableau users and the data. Tableau Data Server allows you to upload and share data extracts, preserve database connections, as well as reuse calculations and field metadata. This means any changes you make to the data-set, calculated fields, parameters, aliases, or definitions, can be saved and shared with others, allowing for a secure, centrally managed and standardized dataset. Additionally, you can leverage your server’s resources to run queries on extracts without having to first transfer them to your local machine.
36. What is the Tableau Data Engine?
Answer: Tableau Data Engine is a really cool feature in Tableau. Its an analytical database designed to achieve instant query response, predictive performance, integrate seamlessly into existing data infrastructure and is not limited to load entire data sets into memory.
If you work with a large amount of data, it does takes some time to import, create indexes and sort data but after that everything speeds up. Tableau Data Engine is not really in-memory technology. The data is stored in disk after it is imported and the RAM is hardly utilized.
37. What is a dual-axis?
Answer: Dual Axis is an excellent phenomenon supported by Tableau that helps users view two scales of two measures in the same graph. Many websites like Indeed.com and others make use of dual axis to show the comparison between two measures and their growth rate in a septic set of years. Dual axes let you compare multiple measures at once, having two independent axes layered on top of one another. This is how it looks like:
38. What is the difference between a treemap and heat map?
Answer: A heat map can be used for comparing categories with color and size. With heat maps, you can compare two different measures together.
Heat Map – Tableau Interview Questions – Edureka A treemap also does the same except it is considered a very powerful visualization as it can be used for illustrating hierarchical data and part-to-whole relationships.
39. What is the disadvantage of context filters?
Answer: The context filter is not frequently changed by the user – if the filter is changed the database must be recomputed and rewrite the temporary table, slowing performance.
When you set a dimension to context, Tableau creates 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.
40. What are Dimensions and Facts?
Answer: Dimensions is nothing but the descriptive text columns and facts are nothing but measures (numerical values) dimension ex: product name city..facts: sales, profit
41. What is the difference between joining and blending in Tableau?
Answer: Joining term is used when you are combining data from the same source, for example, a worksheet in an Excel file or tables in Oracle database
While blending requires two completely defined data sources in your report.
42. How to view underlying SQL Queries in Tableau?
Answer: 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 Documents\My Tableau Repository. For live connection to the data source, you can check log.txt and tabprotosrv.txt files. For an extract, check tdeserver.txt file.
43. How to automate reports?
Answer: You need to publish the report to tableau server while publishing you will find one option to schedule reports. You just need to select the time when you want to refresh data.
44. Describe when would you practice Joins vs. Blending in Tableau?
Answer: If data remains in an individual reservoir, this is regularly popular to practice Joins. While your data is not in one place blending is the common viable method to generate a left join same the connection between your initial and subsequent data sources.
45. What is default Data Blending Join?
Answer: Data blending is the ability to bring data from multiple data sources into one Tableau view, without the need for any special coding. A default blend is equivalent to a left outer join. However, by switching which data source is primary, or by filtering nulls, it is possible to emulate left, right and inner joins.
46. Can we use not – used columns (Columns which are not used in reports but data source has columns) in Tableau Filters?
Ex. In data source, I have a column like
Emp ID, Emp Name, EmpDept,EmpDsignation, EmpSalary
In reports, I am using emp name on columns and empsalry on rows.
I can use emp Designation on Filters
47. Design a view in a map such that if the user selects any state, the cities under that state has to show profit and sales? ( Tableau training in hyderabad )
Answer: According to your question, you must have state, city, profit and sales fields in your dataset.
Step 1: Double click on the state field
Step 2: Drag the city and drop it into Marks card.
Step 3: Drag the sales and drop it into size.
Step 4: Drag profit and drop it into color.
Step 5: Click on size legend and increase the size.
Step 6: Right-click on the state field and select show quick filter.
Step 7: Select any state now and check the view.
48. Suppose my license expires today, will users be able to view dashboards or workbooks which I published in the server earlier?
Answer: If your server license expires today, your username on the server will have the role ‘unlicensed’ which means you cannot access but others can. The site admin can change the ownership to another person so that the extracts do not fail. ( python online training )
49. Is Tableau software good for a strategic acquisition?
Answer: Yes! For sure. It gives you data insight to the extent that other tools can’t. Moreover, it also helps you to plan and point the anomalies and improvise your process for the betterment of your company.
50. How to add Custom Color to Tableau?
Answer: Adding a Custom Color refers to a power tool in Tableau. Restart you Tableau desktop once you save .tps file. From the Measures pane, drag the one you want to add color to Color.