1. Can you describe how and where data is stored when using Power BI?

More often than not, data in Power BI will be stored on the cloud, often in Azure. The two main types of Microsoft Azure cloud services include Azure Blob Storage and Azure SQL Database.

2. What are the critical features of Power BI?

Some of the most important Power BI features are:

• • The ability to visualize data
• • The option to share visualized data with others in the organization
• • The option to use an omni-view to view all data gathered from all sources
• • The option to display the output across several devices that can use Power BI

3. Can you name three crucial DAX rules or concepts?

Some of the key DAX concepts are contexts, functions, and syntaxes:

• • Context: A row context applies to a particular row in a table when a formula’s function affects the row. In contrast, filter context applies when you apply several filters to a calculation.
• • Function: Functions refer to values or “arguments” used in a certain order to carry out a computation. There are a few different categories such as statistical, date or time, and logical.
• • Syntax: Syntax rules apply when creating a formula. If you’re not paying attention to the syntax, you might receive an error message.

4. When are custom visual files required?

In certain situations, you might need to use a visual file when the pre-packaged ones fail to align with your needs. For this, you might hire a developer to build one for you, which can be imported and used to visualize critical information for your team.

5. Can you name some data category types used in Power BI?

Some of the data category types used in Power BI include:

• • Text, referred to as a data string
• • Boolean or logical, also called a true or false type
• • Number, with which users can carry out several functions, such as finding the average or a fraction of the data
• • Date and time, used to extract data such as time, year, and month

6. What is grouping in Power BI?

In Power BI Desktop, you have the option to gather data together and group it (which is what grouping refers to).
To do this, you select a range of elements by pressing Ctrl and clicking the elements. You then select the group option by right-clicking on the element. Grouping is also ideal for making changes to existing groups.

7. What is meant by query folding?

When you need to extract and alter data that you’ve imported from several sources, the transformation stage requires query folding. One advantage of query folding is that because the transformations happen at the data source, Power Query has to do fewer imports.

8. What is the function of responsive slicers?

The reports that Power BI generates contain visual features similar to filters that help users filter out certain data. These visual filters are known as slicers. With a slicer, users can choose certain values and select them while analyzing the report.

9. Can you describe what a content pack is?

Content packs in Power BI refer to the content you have in Power BI. In the pack, you’ll have a glimpse of the data and reports you have. Packs, including your reports or datasets, can be shared with others in your team.

10. Can you describe what row security means?

In Power BI, you have the option to restrict the access to data of certain users. This is achieved through the row security option, which works specifically at the row level.

11. What functions does the Power BI Query editor have?

Some of the functions offered by the Power BI Query editor include:

• • Data imports to a new group
• • An option for managing parameters
• • The option to handle columns, rows, and groups
• • Column renaming and value replacement options
• • The option to execute R Queries
• • The option to use DAX formulas to add custom columns

12. Can you explain why you should use general formatting with data when using Power BI?

When you apply general formatting to data using the Power BI tool, it’s much simpler to categorize it. You can also identify the data quickly and work with the information more easily.

13. How do you change data types in DAX?

More often than not, the data types in DAX will be converted for you. For example, if you use a string for numeric expression, that string will be transformed into a number if the string is valid. If, however, there is an incompatibility issue in the data, where you have a text data type, and the function needs a date type, it will not work.

14. What is meant by M language?

Like DAX, M language (where “M” stands for mash-up) is a language that Power BI supports. M language is used to handle and filter the data, and, more specifically, to combine different data from various supported sources.

15. Are Excel and Power BI compatible? What Power BI or Excel features make analyzing datasets easier?

Since you can use Excel’s workbooks to create reports for Power BI, these two tools are compatible. Uploading workbooks from Excel to Power BI is also possible, as is sharing reports with other team members through Power BI, which makes viewing datasets easier.

16. Which steps should you follow to carry out dynamic filtering?

I would use the following steps to carry out dynamic filtering with Power BI:

• • Set up the data
• • Publish a report to Power BI
• • Publish the report to the group workspace
• • Make a filter link
• • Make a calculated column using a DAX formula to define the values of the column
• • Test and publish the overview report

17. Can you explain the bookmark function of Power BI?

If you want to capture a configured view of your report’s current state, you can use the bookmark feature to achieve this. Default bookmarks capture specific elements of your reports, including slicers and filters.

18. When would you use the selection pane? What does it allow you to do?

If I wanted to view all featured elements on the page, I’d use the selection pane. Similarly, if I wanted to hide the visuals, I could use the selection pane to achieve this.

19. What is meant by incremental refresh?

Incremental refresh defines the division or separation of data that must be refreshed frequently, in order to refresh it separately from data that doesn’t need to be refreshed often. This means that with incremental refreshes, only some parts of the data will be refreshed.

20. Can you explain what the embed code is?

The embed code is used and produced when you want to provide a link and share it with other users. These links are available for publishing data on the Web and are provided by Power BI. They correspond to the Power BI report.

21. How is LTRIM different from RTRIM?

Whereas the LTRIM feature lets you get rid of the space found on the left side of the string, the RTRIM feature can be used to get rid of the white space found on the right side of the string to the final index.