Tableau software is a basic requirement for any business to gain insight into the development of the company.
It allows any non-technical user to easily create or develop the customized dashboards that facilitate insight to a broad spectrum of information.
It is a must know interactive business intelligence tool in the field of data visualization.
Therefore, the candidates who seek the scope in data visualization can get themselves acknowledged as Tableau, which can help them reach their goals.
Below are some Tableau Interview questions which can help the candidates crack the interview and achieve a job.
- What is Tableau?
- Define different parameters in Tableau and their working?
- Distinguish between parameters and filters in Tableau?
- Explain the fact table and the dimension table?
- What are the limitations of parameters of Tableau?
- Explain the aggregation and disaggregation of data in Tableau?
- What are context filters and state the limitations of context filter?
- Mention some file extension in Tableau?
- What are the extracts and schedules in Tableau server?
- Mention and explain some components on the dashboard?
Q1. What is Tableau?
Tableau is a data visualization tool that allows the user to develop an interactive and apt visualization in the form of dashboards, worksheets for the betterment of the business.
Q2. Define different parameters in Tableau and their working?
The Tableau parameters are dynamic variables or dynamic values that replace the constant values in data evaluation and filters.
The user can create an evaluated field value that returns true when the score pars the 80, and otherwise false.
Q3. Distinguish between parameters and filters in Tableau?
The radical difference actually lies in the application.
The parameters allow users to insert the values, which can be integers, float, date, string that can be used in calculations.
The filters only receive values users choose to ‘filter by’ the list, which cannot be used to calculate.
The users can dynamically change the dimensions and measures in parameter but filters do not approve the feature.
Q4. Explain the fact table and the dimension table?
They are the measurable quantities or the numeric metrics of the data which can be analyzed by dimension table.
Facts are stored in the fact table contain foreign keys that uniquely refers to the associated dimension tables.
The fact table is compatible to store the data at the atomic level and thus, it allows a large number of records to be inserted at once.
For instance, a sales category fact table can have a product key, customer key, promotion key referring to a specific event.
They are the descriptive attribute values for various dimensions of each attribute which define multiple characteristics.
A dimension table referring a product key from the fact table can consist of a product name, product type, color, size, and description.
Q5. What are the limitations of parameters of Tableau?
The parameters of Tableau can be represented only in four ways on a dashboard. The parameters do not allow any further multiple selections in a filter.
Q6. Explain the aggregation and disaggregation of data in Tableau?
Aggregation and disaggregation of data in Tableau are the ways to develop a scatterplot to measure and compare the data values.
It is calculated the form of a set of values that return a single numeric value. A default aggregation can be set for any measure which is not user-defined.
The disaggregation of data refers to view each data source row during analyzing of data both dependently and independently.
Q7. What are context filters and state the limitations of context filter?
Tableau helps in making the filtering process straightforward and easy.
It does so by creating a hierarchy of filtering, where all the other remaining filters that are present refer to the context filter for all their subsequent operations.
Thus, the remaining filters will now process the data, that is already passed through the context filter.
Development of one or more context filters helps in improving the performance, as the users do not have to create extra filters on the large data source, which actually reduces the query-execution time.
Limitations of context filter:
Generally, Tableau takes a little time for placing a filter in context.
In case the filter is set as a context one then the software develops a temporary table for that specific context filter.
This table reloads each time and consists of all the variables and values that are not filtered by context or custom SQL filter.
Q8. Mention some file extension in Tableau?
There are many file types and extensions in Tableau.
Some of the file extensions in Tableau are:
- 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)
Q9. What are the extracts and schedules in Tableau server?
First copies or subdivisions of the actual data from the original data source are called data extract.
The workbooks which use the data extracts instead of using live DB connections are faster and the extracted data is imported into Tableau engine.
Later after the extraction of data the users can publish the workbooks which publish the extracts in Tableau server.
And, the scheduled refreshers are the scheduling tasks which are already set for data extract refresh so that they get refreshed automatically while a workbook is published with data extraction.
Q10. Mention and explain some components on the dashboard?
Some of the dashboard components are:
- Horizontal component: In the dashboard the horizontal component’s containers allow the designer to combine the worksheets and dashboards components from left to right across the user’s page and the height of the elements are edited at once.
- Vertical component: In the dashboard Vertical component’s containers allows the user to combine the worksheets and dashboard components from left to right across the user’s page and the width of the elements are edited at once.
- Text: It is an alphabetical order.
- Image Extract: A Tableau is in XML format. In case of extracting images, the Tableau applies the codes to extract an image can be stored in XML.
- Web [URL ACTION]: A Web URL action is a certain type of hyperlink that directs to a web page always or to any other web-based resource that is residing outside of Tableau. The user can hence use the URL actions for linking up of more information about the user’s data, which might be hosted outside of the user’s data source. In order make the link relevant to the user data, the user can substitute field values of a selection into the URL as parameters.