Top Power BI Questions

1. What is Power BI Desktop?

Power BI Desktop is a free, open-source tool for visualizing data. You can create dashboards and reports using the Power BI desktop app.

2. What is DAX?

DAX stands for Data Analysis Expressions and is a standard query language for creating calculations in data analysis. It can be used with any dataset and is particularly useful for analytics queries. To create DAX queries, you need to use Excel as a working file and then use Power Query or Power Pivot to connect it with Power BI.

3. What are Filters in Power BI?

Filters allow you to filter data from any field or table within a dataset to show only specific values or values based on other areas.

4. What are the different views available in Power BI Desktop?

Power BI Desktop has two views:

Dashboard View. This is a simple way to view data inside a Power BI Desktop report. You can use this view to explore your data and make sense of it.

Report View. This is where most of your work will happen! Reports are interactive, allowing you to filter, sort, and analyze your data exactly how you want it using multiple dimensions and measures.

Model View. The user manages Complex Data in this view.

5. What is row-level security?

Row-level security is a feature of Power BI that allows you to control who can see what data by specifying a user ID and report name. For example, you can use this feature to share only specific rows of data while hiding others from view.

6. Where is data stored in Power BI?

Data are stored in Azure SQL Database and Azure Blob Storage.

7. Name the critical component of Power BI.

The critical components are:

• Power Map
• Power Q&A
• Power Pivot
• Power Query
• Power View

8. What do you mean by the content pack?

The Content Pack is a collection of data that can be used to create visualizations, reports, and dashboards or to analyze data. It has been designed to help you work with large volumes of structured and unstructured data in Power BI. The Content Pack is not limited to SQL Server or Azure SQL Database. Still, it can include any structured or unstructured data.

9. Define bi-directional cross-filtering in Power BI

Bidirectional cross-filtering can perform a filter on two different columns in one query.

10. What is query folding in Power BI?

Query folding is a feature in Power BI that allows you to group your data by a single dimension or multiple sizes. This is similar to how you group data in SQL Server and other relational databases. Many people often refer to this as SQL-style reporting because it works similarly to how SQL works when querying tables and grouping rows together.

11. What do you mean by grouping?

When we talk about grouping in Power BI, we mean creating reports with multiple columns related to each other based on their values or conditions.

12. What are the significant differences between Power BI's visual, page, and report-level filters?

In Power BI, you can create filters for visual-level, page-level, and report-level data.

• Visual-level filters are applied to the current view of your report. For example, use this filter if you want to filter by a specific measure in a report.
• Page-level filters are applied to the current page of your report. For example, use this filter to filter on a specific dimension or measure on a page.
• Report-level filters are applied to all reports in your dataset or dataset collection. For example, use this filter if you have multiple reports in your dataset and want them to be filtered at once.

13. Explain responsive slicers in Power BI.

Responsive slicers are a new feature in Power BI that lets you present data in responsive formats, such as cards and tiles.

For example, if you have a dataset that shows the number of customers by region, you should show that data as a bar chart. But if your audience has different screen sizes, having smaller charts with more detail might be more beneficial. In addition, you can use responsive slicer controls to format your data visually.

14. What are KPIs in Power BI?

KPIs (key performance indicators) are metrics that measure the success of your organization. KPIs can be used to track strategic initiatives and make informed decisions about allocating resources. The Power BI team has built powerful features around KPI creation, analysis, and reporting.

15. Explain Power BI Designer.

Power BI Designer is a tool for creating and editing many types of KPIs. This tool can create basic or complex KPI tables, charts, maps, and dashboards.

16. Different stages in the working of Power BI?

• Data integration is the process of combining data from multiple sources into a single destination.
• Data processing is the process of transforming raw data into meaningful information by applying specialized algorithms.
• Data presentation is displaying and visualizing the data, usually in a way that enables the audience to understand it easily.

17. Application of PowerBI

• Power BI is a cloud service that lets you create interactive dashboards that help business users gain better insight into their data and make better decisions faster.
• To collaborate on reports and documents with others.
• To create visualizations that communicate complex information in an easy-to-understand way.

18. What is the CALCULATE function in DAX?

The CALCULATE function in DAX allows you to calculate a sum, average, or count of values. It is typically used for calculations like calculating the total for a range or calculating the average values in a column.

19. Different types of connections in Power BI

SQL Server Import

This mode allows you to import data from SQL Server. In this mode, you can select the data source and the name of your table. You also have the option to select all tables or individual tables as well.

Live connection

This is the most common mode used by Power BI users. In this mode, you can connect to your database directly through Azure or any other storage provider your organization may use. The data will then be pulled into Power BI and analyzed at scale, giving you a real-time visual representation of your data.

Direct query

A direct query is a potent tool that allows you to access any data source through an API call, making it possible to connect to third-party services such as Twitter or Facebook (if they support OAuth authentication). This gives you free access to third-party databases and other services that do not have an open API available yet.

20. What is GetData?

GetData is a new feature in Power BI that allows you to get data from any source and bring it into your dashboard. It's like "scraping" the web for information - except instead of putting the data into Excel spreadsheets or text files, we're putting it into Power BI!