Q: What is Power BI?
Power BI is a business intelligence tool developed by Microsoft. It is used to visualize and analyze data from various sources, creating interactive reports and dashboards.
Q: What are the main components of Power BI?
Power BI has three main components: Power BI Desktop (for creating reports), Power BI Service (for sharing and collaborating), and Power BI Mobile (for accessing reports on mobile devices).
Q: Name two types of connectivity modes in Power BI?
Two types of connectivity modes used in Power BI are:
-
- Import
- Direct Query
Q: How do you import data into Power BI?
In Power BI Desktop, click on “Get Data” and choose the data source (e.g., Excel, SQL Server, SharePoint). Then, follow the prompts to connect and import the data.
Q: What is a measure in Power BI?
A measure is a calculation that aggregates data (e.g., sum, average) to provide valuable insights. Measures are often used in visualizations to show meaningful information.
Q: How do you create a calculated column in Power BI?
To create a calculated column, go to the Power BI Desktop’s Data View, right-click on the table, and select “New Column.” Then, write a formula using DAX (Data Analysis Expressions) language to define the calculated column’s values.
Q: What is the difference between a calculated column and a measure?
A calculated column is computed at the data model level and becomes a permanent part of the dataset, while a measure is calculated on at the visualization level.
Q: What is DAX in Power BI?
DAX (Data Analysis Expressions) is a formula language used in Power BI to create custom calculations and expressions.
Q: Can you explain the difference between a filter and a slicer in Power BI?
Filters are applied directly to visuals, while slicers are interactive elements that allow users to choose filter criteria visually. Both filters and slicers are used to control data visibility, but the main difference is the way they are presented.
Q: What are the different types of filters in Power BI?
There are three types of filters in Power BI: Visual level filters, Page level filters, and Report level filters.
Q: How do you create a report in Power BI?
First, import data into Power BI Desktop. Then, design your report by adding visuals like charts, tables, and slicers. Customize the layout and formatting to make it visually appealing.
Q: What is the purpose of Power Query in Power BI?
Power Query is used to transform, shape, and combine data from multiple sources before importing it into Power BI.
Q: How can you share a Power BI report with others?
You can share a Power BI report by publishing it to Power BI Service. Then, you can invite others to access the report through email or create a public link to share it with a broader audience.
Q: What are the benefits of using Power BI over Excel for data analysis?
Power BI offers better data visualization, interactive reports, and real-time data access compared to Excel. It can handle larger datasets efficiently and is more suitable for collaborative work in a business intelligence environment.
Q: How do you create a relationship between two tables in Power BI?
In Power BI Desktop, go to the “Model” view, drag and drop a field from one table to the related field in another table to establish a relationship.
Q: Can you explain the difference between Power BI Desktop and Power BI Service?
Power BI Desktop is used to create reports and data models locally, while Power BI Service allows you to publish, share, and collaborate on reports in the cloud.
Q: How can you create a hierarchy in Power BI?
In Power BI Desktop, drag and drop fields onto each other in the “Fields” pane to create a hierarchy.
Q: What kind of data you can store in Power BI?
In Power BI, you can store two main types of data:
- Fact Tables: Fact tables store important numerical data for analysis. They usually contain raw information that is not organized or simplified.
- Dimension Tables: Dimension tables store attributes and details that describe the objects in the fact table. They provide additional information to help understand the data in the fact table better.
Q: What is a KPI (Key Performance Indicator) in Power BI?
A KPI is a visual representation of key business metrics used to monitor performance against specific targets.
Q: What are the different types of joins in Power BI?
The different types of joins are Inner Join, Left Outer Join, Right Outer Join, and Full Outer Join.
Q: What is the use of Power BI bookmarks?
Power BI bookmarks allow users to capture the current report state and save it for later navigation.
Q: What is the use of drillthrough in Power BI?
Drillthrough allows users to navigate to more detailed information related to a specific data point.
Q: What is the use of Power BI templates?
Power BI templates allow you to save report designs as template files for reuse in other reports.
Q: Can you connect Power BI to live data sources?
Yes, you can connect Power BI to live data sources using DirectQuery, which allows real-time data access.
Q: How can you use the Power BI Q&A feature to ask questions?
In Power BI Service, use the “Ask a question” box and type your question in natural language to
receive visualizations as answers.
Q: What is Power Pivot Data Model?
The Power Pivot Data Model is like a digital storage space where you can organize data into tables and connect them together. It helps businesses keep track of information and analyze it easily.
Q: What is M language in Power BI?
M language is a type of computer language used in Power Query. It’s like a set of instructions that help Power Query work with data. It’s easy to use and works like other computer languages, but it’s focused on dealing with data in a functional way.
Q: What is Power BI Gateway?
Power BI Gateway is a software component that allows secure data transfer between Power BI Service and on-premises data sources. It enables real-time data access for reports and dashboards hosted in the cloud.
Q: What is the benefit of using Power BI Gateway?
Power BI Gateway allows you to refresh data from on-premises data sources and keep the cloud-based report up-to-date.