The rise of business intelligence (BI) tools happened back in 2011, when Microsoft too realized the need of the hour – to build a BI tool of its own. They made it happen in 2015, with the release of Microsoft Power BI for the general audience. In less than a decade of its existence, Power BI has become the most sought-after name for all analytical needs. More companies than ever are looking to hire skilled and certified Power BI professionals. Once you complete your Power BI training and certification, the only thing left to do will be to ace your Interview. This is where our blog comes in the picture to help you. Here is a list containing the top Power BI interview questions and answers. Whether you are a beginner, a developer, or an experienced professional, this blog has it all. Let’s start with a few Power BI basic interview questions.

Power BI Questions for Freshers

Here are a few often-asked Power BI questions and answers for beginners. Going through these will help you get your basic questions sorted out.

Question 1. What is Power BI? How does Power BI benefit businesses?

Ans. Power BI is a pool of BI tools that facilitate companies in visualizing and sharing insights from their valuable data. Power BI enables businesses in enhancing their competitiveness and efficiency by aiding them in making informed and data-driven decisions.

Question 2. What are the major components of Power BI?

Ans. The major components of Power BI are:

• Power BI Desktop
• Power BI Service
• Power BI Embedded
• Power Pivot
• Power BI Report Server
• Power BI Mobile Apps
• Data Sources
• Power BI Gateway
• Power BI Report Server
• Power BI Query
• Power View
• Power Q&A
• Power Maps

Question 3. Give a list of Power BI data sources.

Ans. Various data sources supported by Power BI include:

• Cloud-based services (for instance, Salesforce, Azure SQL Database, Google Analytics)
• Web-based sources (for instance, OData feeds, REST APIs)
• Relational database (for instance, Oracle, SQL Server, MySQL)
• On-premises data sources (for instance, Hadoop, SharePoint)
• File-based sources (for instance, CSV, XML, Excel, JSON)

Question 4. What are the different types of filters in Power BI reports?

Ans. There are many different types of Filters in Power BI reports namely,

• Visual-level filters
• Report-level filters
• Relative data filters
• Top N filters
• Cross-filtering & cross-highlighting
• Page-level filters
• Relative filters
• Drillthrough filters
• Slicer filters
• Advanced filters using DAX

Question 5. What is the use of a data gateway in Power BI?

Ans. Data gateway in Power BI is a service. It aids businesses in securely transferring data between Power BI Service and on-premises data sources. This service plays the role of a connector between these two. The data can be assessed from on-premises sources directly by Power BI, without exposing it to the internet.

You May Also Read– Power BI Tutorial For Beginners

Question 6. What are four types of cardinality in Power BI?

Ans. The four types of cardinality in Power BI are:

• One to one
• One to many
• Many to one
• Many to many

Power BI Technical Interview Questions

Power BI technical interview questions are usually posed to those with some working experience of the tool. Hence, if you are not a complete fresher, then be prepared to be asked such questions.

Question 7. How to create custom visuals in Power BI?

Ans. The Custom Visual SDK can be used to create custom visuals in Power BI. It is based on D3.js and JavaScript. The steps to make it happen are:

• Set up the Power BI environment to accommodate custom visual development
• Explore the custom visual options available in Power BI
• Create basic visualizations
• Improve these custom visuals by employing advanced functionality and features
• Test and debug them

Question 8. What is a star schema? 

Ans. A star schema refers to a multi-dimensional data model that is employed by enterprises to organize their data in a database. The purpose is to make this data easily understandable and analysis-ready. It is simpler to maintain, understand, and design. It provides swift integration with data cubes and OLAP systems.

Question 9. What is cardinality in Power BI?

Ans. Cardinality, in terms of Power BI, refers to the number or relationship of distinct values shared among two tables in a data model. It gives a clear picture on what the rows of one table have to do with the rows of another table, on the basis of specified column(s).

Question 10. What is a common issue that arises upon using many-to-many cardinality in a relationship?

Ans. Many-to-many cardinality in a relationship can certainly lead to issues when different levels of granularity are present in the data. This can lead to duplications in the datasets that have returned, causing incorrect results. 

Question 11. What is the concept behind row-level security in Power BI?

Ans. Row-level security, also called RLS, is a powerful Power BI feature that facilitates in restricting all data access for certain users as per their attributes or roles. DAX expressions are designed to implement RLS. These filter the data model as per the user’s context so that the user is only able to see what they have been authorized to see.

Question 12. How is a donut chart different from a pie chart in Power BI?

Ans. A Donut Chart in Power BI has a hold in the middle, giving it a ring-like structure and appearance. A pie chart, on the contrary, is a complete circle wherein the data is displayed in segments.

Both charts are used to showcase proportions of different categories of a complete whole. However, a donut chart is able to display more info in the center. 

Question 13. What is the concept of data profiling here?

Ans. Data profiling in Power BI refers to examination and analysis of data. The purpose is to understand the quality, distribution, and structure of data. It can be performed via Power Query, which offers different profiling features. These features include data type detection, error highlighting, and column statistics, among others. 

It is important to identify inconsistencies, outliers, and data quality issues. If unidentified, these can lead to negative effects on the reliability and accuracy of reporting and analysis. 

Wrap-Up

There are plenty of Power BI interview questions to explore, depending upon your level of experience and expertise. This blog is an amalgamation of some of the key interview questions for Power BI to help you get into any organization that you have aimed at.

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