Tableau Interview Questions – Set 01

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What are the different data types in Tableau?

Tableau expresses fields and assigns data types automatically. If the data source appoints the data type, Tableau will use that data type. If the data source doesn’t individually assign a data type, Tableau will assign one. Tableau consist of the following data types:

  • Date values
  • Text values
  • Numerical values
  • Date and time values
  • Boolean values (True or False conditions)
  • Geographic values (longitude and latitude used for maps)

What is a Tableau Data Server?

Tableau server acts as a middle man between the data and Tableau uses. Tableau Data Server allows you to share and upload data extracts, preserve database connections, as well as reuse calculations and field metadata.

This means any changes you can make for the calculated field, data-set, aliases, definitions or parameters, can be saved and shared with others, that allows for a secure, centrally managed and standardized dataset as well as you can leverage your server’s resources to run queries on extracts without having first to transfer them to your local machine.

How many numbers of rows Tableau can utilize at one time?

Tableau is not restricted by the number of rows in the table. Tableau is used to access petabytes of data because it only retrieves the rows and columns.

Can Tableau be installed on macOS?

Yes, Tableau Desktop can be installed on Mac as well as window operating system.

How many tables you can join in Tableau?

In Tableau, you can join an atmost 32 tables.

What is the Tableau Data Engine?

Tableau Data Engine is a cool feature in Tableau. It?s an analytical database that designed to achieve instant query response, predictive performance, integrate seamlessly into existing data infrastructure, and it is not limited to load entire data sets into the memory.

If you are work with a large amount of data, it does take some time to create indexes, import, and sort data, but after that everything speeds up. Tableau Data Engine is not in-memory technology. The data is stored in disk after its import, and the RAM is hardly utilized.

What is Tableau?

  • ableau is a powerful data visualization tool used in the business intelligence industry.
  • It simplifies the raw data into a very easily understandable format.
  • It visualizes and creates interactive, sharable dashboards.
  • Tableau is not required any technical or programming skills.

Tableau software is suitable for strategic acquisition or not?

Yes, Tableau software is suitable for strategic acquisition because it gives data insight to the extent that other tools can’t.

Explain the different connections you can make with your datasets?

We can connect the datasets in two ways, such as:

Live: Live connection sends queries to your database and retrieves data. These queries will return whatever data is currently in the database.
Extract: Extracts connection saved subsets of data that use to improve performance or to take the advantages of Tableau functionality which are not supported or available in your original data.

How to create a Calculated Field in Tableau?

  • Click on the drop-down option to the right of dimension on the data pane and go to the create options and select the calculated field to open the calculation editor.
  • Name the calculated field and create a formula.