Top 100 Power BI Interview Questions and Answers for 2024

Are you an experienced Power BI developer or a Power BI analyst preparing for a job interview? Do you want to know what kind of questions you can expect during your interview? Then you've come to the right place! In this article, we will provide you with a list of Power BI interview questions that are commonly asked during interviews. From Power BI scenario-based interview questions to Power BI developer interview questions, we have got you covered. So, whether you are looking for tips on how to prepare for your interview or want to test your knowledge of Power BI, keep reading to find out more.

Interview Questions on Power BI

What is Power BI?

Answer: Power BI is a business analytics service by Microsoft that provides interactive visualizations and business intelligence capabilities with an interface simple enough for end users to create their own reports and dashboards.

What are the components of Power BI?

Answer: Power BI consists of three main components: Power BI Desktop, Power BI Service, and Power BI Mobile. Power BI Desktop is used to create reports and data models, while Power BI Service is a cloud-based service that allows users to publish, share and collaborate on their reports. Power BI Mobile is a mobile application that allows users to access their reports on-the-go.

What is DAX in Power BI?

Answer: DAX (Data Analysis Expressions) is a formula language used in Power BI to create custom calculations, measures and aggregations. It is similar to Excel formulas, but designed specifically for Power BI data models.

What is Power Query in Power BI?

Answer: Power Query is a data transformation and cleaning tool in Power BI that allows users to connect to various data sources, transform and shape the data, and load it into the data model. It can be used to perform a wide range of data cleaning and transformation tasks.

What is the difference between calculated columns and measures in Power BI?

Answer: Calculated columns are columns created in the data model using DAX expressions that perform calculations on each row of data. Measures are also created using DAX, but they aggregate data across multiple rows or tables in the data model. Measures are typically used in visualizations and reports to display aggregate values, such as totals or averages.

How can you optimize Power BI report performance?

Answer: There are several ways to optimize Power BI report performance, including reducing the number of visuals on a page, using filters to limit the amount of data displayed, minimizing the use of calculated columns, and using incremental refresh to load only new or updated data.

What are drill-through filters in Power BI?

Answer: Drill-through filters allow users to drill down into more detailed data by clicking on a specific data point in a visualization. The filter context is passed to a second page or visualization that shows more detailed data related to the selected data point.

What is Power BI Gateway?

Answer: Power BI Gateway is a client application that allows on-premises data sources to be accessed from the Power BI Service. It can be used to refresh data from on-premises data sources, such as SQL Server, Oracle, and SharePoint.

What is the difference between Power BI Pro and Power BI Premium?

Answer: Power BI Pro is a paid version of Power BI that allows users to create and share reports with other Power BI Pro users. Power BI Premium is a higher-end version of Power BI that includes additional features, such as larger data capacity, more frequent data refreshes, and the ability to share reports with a broader audience.

How can you integrate Power BI with other Microsoft products?

Answer: Power BI can be integrated with other Microsoft products, such as Excel, SharePoint, and Dynamics 365. This integration allows users to access and analyze data from these products directly within Power BI.  

What are the different types of visualizations in Power BI?

Answer: Power BI offers a wide range of visualizations, including tables, charts, maps, gauges, cards, and custom visuals. These visualizations can be customized and formatted to meet specific reporting needs.  

What is the difference between a slicer and a filter in Power BI?

Answer: A slicer is a visual component that allows users to filter data based on a specific category, such as date, region, or product. A filter, on the other hand, is a data manipulation function that allows users to exclude or include certain data based on criteria defined by the user.

Slicers and Filters

How can you create a calculated table in Power BI?

Answer: A calculated table is created using DAX expressions that define the rows and columns of the table. To create a calculated table, you can use the "New Table" option in Power BI Desktop and then enter the DAX expression that defines the table.  

What is the difference between a data model and a data source in Power BI?

Answer: A data model is a collection of tables, relationships, and calculations that define the structure of the data in Power BI. A data source, on the other hand, is the physical location where the data is stored, such as a database, file, or web service.  

What are the benefits of using Power BI?

Answer: Power BI provides several benefits, including the ability to visualize and analyze data in real-time, easy integration with other Microsoft products, easy data sharing and collaboration, and the ability to create customized reports and dashboards.  

What is the difference between Power BI and Excel?

Answer: While both Power BI and Excel are used for data analysis and reporting, there are some key differences between the two. Power BI is designed for business intelligence and data visualization, while Excel is more of a general-purpose spreadsheet application. Power BI allows for more complex data modeling and visualizations, while Excel is better suited for simple calculations and analysis.

How can you create a custom visual in Power BI?

Answer: To create a custom visual in Power BI, you can use the Power BI Developer Tools to build a custom visual using HTML, CSS, and JavaScript. Once the visual is created, it can be imported into Power BI and used in reports and dashboards.  

What is the difference between Power BI and Tableau?

Answer: Power BI and Tableau are both popular business intelligence and data visualization tools, but there are some key differences between the two. Power BI is more tightly integrated with other Microsoft products, such as Excel and SharePoint, while Tableau is known for its flexibility and ease of use. Power BI is typically more affordable, while Tableau offers more advanced visualization capabilities.  

How can you schedule data refresh in Power BI?

Answer: To schedule data refresh in Power BI, you can use the Power BI Service to create a refresh schedule for each data source in the data model. The schedule can be set to refresh the data at a specific time or interval, such as daily, weekly, or monthly.  

What is the difference between a dashboard and a report in Power BI?

Answer: A dashboard is a high-level summary of key performance indicators and metrics, while a report provides more detailed information and analysis. Dashboards typically include visualizations that are updated in real-time, while reports may be more static and require manual updates.  

How can you publish a Power BI report?

Answer: To publish a Power BI report, you can use the Power BI Service to upload the report file created in Power BI Desktop. Once the report is uploaded, it can be shared with others and accessed from anywhere with an internet connection.  

What is the difference between a calculated field and a calculated table in Power BI?

Answer: A calculated field is a column that is created in a table using a DAX expression, while a calculated table is a table that is created using a DAX expression. Calculated fields are used to perform calculations on existing columns in a table, while calculated tables are used to create new tables based on existing data.  

What is the difference between a live connection and an imported dataset in Power BI?

Answer: A live connection allows Power BI to connect directly to a data source, such as a database or web service, and retrieve data in real-time. An imported dataset, on the other hand, is a copy of the data that is stored in the Power BI data model. Live connections are typically used for large datasets that are frequently updated, while imported datasets are used for smaller datasets that do not change frequently.  

What is Power BI Embedded?

Answer: Power BI Embedded is a feature that allows developers to embed Power BI visualizations and reports directly into their applications. This feature allows users to access Power BI reports and dashboards without leaving the application.  

What is Power BI Report Server?

Answer: Power BI Report Server is an on-premises solution that allows users to create and share Power BI reports within their organization's network. This solution is designed for organizations that require strict control over their data and cannot store data in the cloud.  

What is the difference between a primary key and a foreign key in Power BI?

Answer: A primary key is a unique identifier that is used to identify each row in a table, while a foreign key is a column in one table that is used to link to the primary key in another table. Primary keys are used to maintain data integrity, while foreign keys are used to establish relationships between tables.  

What is the difference between a data source and a data gateway in Power BI?

Answer: A data source is a physical location where the data is stored, such as a database or file, while a data gateway is a software component that allows Power BI to connect to data sources that are located behind a firewall or on-premises.  

What is the difference between a calculated column and a calculated measure in Power BI?

Answer: A calculated column is a column that is created in a table using a DAX expression, while a calculated measure is a calculation that is performed on a column or set of columns in a table. Calculated columns are used to create new columns based on existing data, while calculated measures are used to perform calculations on existing data.  

What is the difference between Power BI Pro and Power BI Premium Per User?

Answer: Power BI Pro is a paid version of Power BI that allows users to create and share reports with other Power BI Pro users. Power BI Premium Per User is a higher-end version of Power BI that provides additional features, such as larger data capacity, more frequent data refreshes, and the ability to share reports with a broader audience, on a per-user basis.  

What is the difference between Power BI Pro and Power BI Premium Per Capacity?

Answer: Power BI Pro is a paid version of Power BI that allows users to create and share reports with other Power BI Pro users. Power BI Premium Per Capacity is a higher-end version of Power BI that provides additional features, such as larger data capacity, more frequent data refreshes, and the ability to share reports with a broader audience, on a shared capacity basis.  

What is the difference between Power BI Desktop and Power BI Service?

Answer: Power BI Desktop is a desktop application that is used to create and publish reports and visualizations, while Power BI Service is a cloud-based service that allows users to view and interact with reports and dashboards created in Power BI Desktop.  

What is the difference between a clustered and a non-clustered index in Power BI?

Answer: A clustered index is an index that determines the physical order of data in a table, while a non-clustered index is an index that does not determine the physical order of data in a table. Clustered indexes are typically used for tables that have a large number of rows and require fast data retrieval, while non-clustered indexes are used to improve query performance by creating a smaller subset of data for each query.  

How can you create a drill-through report in Power BI?

Answer: To create a drill-through report in Power BI, you can use the "Drillthrough" feature to define the relationship between the two reports. Once the relationship is defined, you can add drill-through buttons to the original report that allow users to navigate to the drill-through report.  

What is the difference between a stacked chart and a clustered chart in Power BI?

Answer: A stacked chart is a chart that shows the total value of each category, broken down by subcategories, while a clustered chart is a chart that shows the value of each category side-by-side. Stacked charts are typically used to show the composition of a category, while clustered charts are used to compare values across categories.  

What is the difference between a left join and an inner join in Power BI?

Answer: A left join returns all the rows from the left table and matching rows from the right table, while an inner join returns only the matching rows from both tables. Left joins are used to include all the rows from one table, even if there is no matching data in the other table, while inner joins are used to include only the rows that have matching data in both tables.  

How can you create a measure in Power BI?

Answer: To create a measure in Power BI, you can use the "New Measure" option in the "Fields" pane and enter a DAX expression that defines the calculation. Measures can be used to perform calculations on columns or tables in the data model.  

What is the difference between a stacked column chart and a stacked bar chart in Power BI?

Answer: A stacked column chart is a chart that shows the composition of each category using stacked columns, while a stacked bar chart is a chart that shows the composition of each category using stacked bars. Stacked column charts are typically used to show changes over time, while stacked bar charts are used to compare values across categories.  

What is the difference between a table and a matrix in Power BI?

Answer: A table is a visual component that shows data in a tabular format, while a matrix is a visual component that shows data in a tabular format with subtotals and grand totals. Tables are typically used to show detailed data, while matrices are used to summarize data.  

What is the difference between a slicer and a drill-down in Power BI?

Answer: A slicer is a visual component that allows users to filter data based on a specific category, while a drill-down is a visual component that allows users to navigate through different levels of detail within a visualization. Slicers are typically used to filter data, while drill-downs are used to explore data.  

What is the difference between Power BI and Power Pivot?

Answer: Power BI and Power Pivot are both Microsoft products that are used for data analysis and reporting, but there are some key differences between the two. Power BI is designed for business intelligence and data visualization, while Power Pivot is a data modeling tool that is used to create data models within Excel.  

How can you create a calculated hierarchy in Power BI?

Answer: To create a calculated hierarchy in Power BI, you can use the "New Hierarchy" option in the "Fields" pane and select the columns that you want to include in the hierarchy. Once the hierarchy is created, you can use it to group data in your visualizations and reports.  

What is the difference between Power BI and Power Query?

Answer: Power BI and Power Query are both Microsoft products that are used for data analysis and reporting, but there are some key differences between the two. Power BI is designed for business intelligence and data visualization, while Power Query is a data transformation and cleaning tool that is used to connect to and transform data from various sources.  

What is the difference between a bar chart and a column chart in Power BI?

Answer: A bar chart is a chart that shows data using horizontal bars, while a column chart is a chart that shows data using vertical bars. Bar charts are typically used to compare values across categories, while column charts are used to show changes over time.  

How can you create a calculated table in Power BI using Power Query?

Answer: To create a calculated table in Power BI using Power Query, you can use the "New Source" option in the "Get Data" menu and select "Blank Query." Once the query is created, you can enter a Power Query expression that defines the rows and columns of the table.  

What is the difference between Power BI and Power Map?

Answer: Power BI and Power Map are both Microsoft products that are used for data analysis and reporting, but there are some key differences between the two. Power BI is designed for business intelligence and data visualization, while Power Map is a 3D mapping tool that is used to create interactive maps within Excel.  

How can you create a custom theme in Power BI?

Answer: To create a custom theme in Power BI, you can use the "Themes" feature to define the colors, fonts, and other visual elements that you want to use. Once the theme is created, you can apply it to your reports and visualizations.  

What is the difference between a pie chart and a donut chart in Power BI?

Answer: A pie chart is a chart that shows data as a circle divided into slices, while a donut chart is a chart that shows data as a ring divided into slices. Pie charts are typically used to show the composition of a category, while donut charts are used to show the composition of a category with a hole in the center.  

What is the difference between a waterfall chart and a stacked chart in Power BI?

Answer: A waterfall chart is a chart that shows how an initial value is affected by a series of positive and negative values, while a stacked chart is a chart that shows the composition of each category using stacked bars or columns. Waterfall charts are typically used to show changes in financial data, while stacked charts are used to compare values across categories.  

What is the difference between Power BI and Power View?

Answer: Power BI and Power View are both Microsoft products that are used for data analysis and reporting, but there are some key differences between the two. Power BI is designed for business intelligence and data visualization, while Power View is a data exploration and visualization tool that is used to create interactive reports within Excel.  

How can you create a drill-through button in Power BI?

Answer: To create a drill-through button in Power BI, you can use the "Action" feature to define the action that should be taken when the button is clicked. Once the action is defined, you can add the button to your report and specify the destination report or visualization.  

What is the difference between a line chart and a scatter chart in Power BI?

Answer: A line chart is a chart that shows how a value changes over time, while a scatter chart is a chart that shows the relationship between two variables. Line charts are typically used to show trends in data, while scatter charts are used to show the correlation between two variables.  

How can you create a calculated column using Power Query in Power BI?

Answer: To create a calculated column using Power Query in Power BI, you can use the "Add Column" option in the "Transform Data" menu and enter a Power Query expression that defines the calculation. Calculated columns are used to create new columns based on existing data.  

What is the difference between a relative date slicer and a standard date slicer in Power BI?

Answer: A relative date slicer is a slicer that allows users to filter data based on a relative date range, such as the last 7 days or last month. A standard date slicer, on the other hand, allows users to filter data based on a specific date range, such as a specific month or year.  

How can you create a KPI in Power BI?

Answer: To create a KPI (key performance indicator) in Power BI, you can use the "New Measure" option in the "Fields" pane and enter a DAX expression that defines the calculation. Once the KPI is created, you can format it to show a visual indicator of performance, such as a traffic light or gauge.  

What is the difference between a tooltip and a drill-through in Power BI?

Answer: A tooltip is a visual component that provides additional information when the user hovers over a data point, while a drill-through is a visual component that allows users to navigate to a more detailed report or visualization. Tooltips are typically used to provide context for data, while drill-throughs are used to explore data in more detail.  

What is the difference between a direct query and a import query in Power BI?

Answer: A direct query allows Power BI to connect directly to a data source and retrieve data in real-time, while an import query retrieves data from a data source and stores it in the Power BI data model. Direct queries are typically used for large datasets that are frequently updated, while import queries are used for smaller datasets that do not change frequently.  

How can you create a custom connector in Power BI?

Answer: To create a custom connector in Power BI, you can use the Power Query SDK to build a connector using C# or Visual Basic. Once the connector is built, it can be imported into Power BI and used to connect to a data source.  

What is the difference between Power BI Report Builder and Power BI Desktop?

Answer: Power BI Report Builder is a desktop application that is used to create paginated reports, while Power BI Desktop is a desktop application that is used to create interactive reports and visualizations. Power BI Report Builder is typically used for more traditional reporting scenarios, while Power BI Desktop is used for more interactive and visual reporting scenarios.  

How can you create a drill-through visualization in Power BI?

Answer: To create a drill-through visualization in Power BI, you can use the "Drillthrough" feature to define the relationship between the two visualizations. Once the relationship is defined, you can add drill-through buttons to the original visualization that allow users to navigate to the drill-through visualization.  

What is the difference between Power BI Mobile and Power BI Desktop?

Answer: Power BI Mobile is a mobile application that allows users to view and interact with Power BI reports and dashboards on their mobile devices, while Power BI Desktop is a desktop application that is used to create and publish reports and visualizations.  

How can you create a custom visual in Power BI using R?

Answer: To create a custom visual in Power BI using R, you can use the "Script Visual" feature to write R code that generates the visualization. Once the code is written, you can add it to your report and use it like any other visual.  

What is the difference between a line chart and an area chart in Power BI?

Answer: A line chart is a chart that shows how a value changes over time, while an area chart is a chart that shows the composition of a category using an area. Line charts are typically used to show trends in data, while area charts are used to show the proportion of each category over time.  

How can you create a custom visual in Power BI using Python?

Answer: To create a custom visual in Power BI using Python, you can use the "Python Visual" feature to write Python code that generates the visualization. Once the code is written, you can add it to your report and use it like any other visual.  

What is the difference between a histogram and a bar chart in Power BI?

A histogram is a chart that shows the distribution of data within a range of values, while a bar chart is a chart that shows the value of each category using bars. Histograms are typically used to show the frequency of data within a range, while bar charts are used to compare values across categories.  

How can you create a waterfall chart in Power BI?

Answer: To create a waterfall chart in Power BI, you can use the "Waterfall" chart type and specify the initial value, the positive values, and the negative values. Once the chart is created, you can format it to show the change in value for each category.  

What is the difference between a matrix and a table in Power BI?

Answer: A matrix is a visual component that shows data in a tabular format with subtotals and grand totals, while a table is a visual component that shows data in a tabular format. Matrices are typically used to summarize data, while tables are used to show detailed data.  

How can you create a clustered column chart in Power BI?

Answer: To create a clustered column chart in Power BI, you can use the "Column Chart" chart type and specify the category and value fields. Once the chart is created, you can format it to show the values side-by-side.  

What is the difference between a stacked column chart and a 100% stacked column chart in Power BI?

Answer: A stacked column chart is a chart that shows the composition of each category using stacked columns, while a 100% stacked column chart is a chart that shows the composition of each category as a percentage of the total. Stacked column charts are typically used to show changes over time, while 100% stacked column charts are used to compare the proportion of each category.  

How can you create a drill-through report in Power BI using a parameter?

Answer: To create a drill-through report in Power BI using a parameter, you can define a parameter in the original report that is used to filter the data in the drill-through report. Once the parameter is defined, you can add a drill-through button that passes the parameter to the drill-through report.  

How can you create a custom visual in Power BI using JavaScript?

Answer: To create a custom visual in Power BI using JavaScript, you can use the "Custom Visual" feature to write JavaScript code that generates the visualization. Once the code is written, you can add it to your report and use it like any other visual.  

What is the difference between a multi-row card and a table in Power BI?

Answer: A multi-row card is a visual component that shows data in a tabular format but with the ability to display multiple rows of data for each category, while a table is a visual component that shows data in a tabular format. Multi-row cards are typically used to show summarized data, while tables are used to show detailed data.  

How can you create a hierarchy in Power BI?

Answer: To create a hierarchy in Power BI, you can use the "Manage Relationships" option to define the relationship between the tables that you want to include in the hierarchy. Once the relationship is defined, you can use the "New Hierarchy" option in the "Fields" pane to create the hierarchy and select the columns that you want to include.  

What is the difference between a scatter chart and a bubble chart in Power BI?

Answer: A scatter chart is a chart that shows the relationship between two variables, while a bubble chart is a chart that shows the relationship between three variables using circles of different sizes. Scatter charts are typically used to show the correlation between two variables, while bubble charts are used to show the correlation between three variables.  

How can you create a custom connector in Power BI using M code?

Answer: To create a custom connector in Power BI using M code, you can use the Power Query SDK to build a connector using M code. Once the connector is built, it can be imported into Power BI and used to connect to a data source.  

What is the difference between a card and a gauge in Power BI?

Answer: A card is a visual component that shows a single value, while a gauge is a visual component that shows a single value on a gauge. Cards are typically used to show summarized data, while gauges are used to show progress towards a goal or target.  

How can you create a custom theme in Power BI using JSON?

Answer: To create a custom theme in Power BI using JSON, you can use the "Themes" feature to define the colors, fonts, and other visual elements that you want to use. Once the theme is created, you can save it as a JSON file and import it into Power BI.  

What is the difference between a donut chart and a pie chart in Power BI?

Answer: A donut chart is a chart that shows data as a ring divided into slices, while a pie chart is a chart that shows data as a circle divided into slices. Donut charts are typically used to show the composition of a category with a hole in the center, while pie charts are used to show the composition of a category.  

How can you create a custom visual in Power BI using D3.js?

Answer: To create a custom visual in Power BI using D3.js, you can use the "Custom Visual" feature to write JavaScript code that generates the visualization using the D3.js library. Once the code is written, you can add it to your report and use it like any other visual.  

How can you create a custom visual in Power BI using SVG?

Answer: To create a custom visual in Power BI using SVG, you can use the "Custom Visual" feature to write JavaScript code that generates the visualization using the SVG (Scalable Vector Graphics) format. Once the code is written, you can add it to your report and use it like any other visual.  

What is the difference between a tree map and a sunburst chart in Power BI?

Answer: A tree map is a chart that shows the composition of a category using rectangles of different sizes, while a sunburst chart is a chart that shows the composition of a category using concentric circles. Tree maps are typically used to show the proportion of each category, while sunburst charts are used to show the hierarchy of the categories.  

How can you create a custom connector in Power BI using ODBC?

Answer: To create a custom connector in Power BI using ODBC, you can use the Power Query SDK to build a connector using ODBC. Once the connector is built, it can be imported into Power BI and used to connect to a data source.  

What is the difference between a scatter chart and a bubble chart in Power BI?

Answer: A scatter chart is a chart that shows the relationship between two variables, while a bubble chart is a chart that shows the relationship between three variables using circles of different sizes. Scatter charts are typically used to show the correlation between two variables, while bubble charts are used to show the correlation between three variables.  

How can you create a custom visual in Power BI using HTML?

Answer: To create a custom visual in Power BI using HTML, you can use the "Custom Visual" feature to write JavaScript code that generates the visualization using HTML and CSS. Once the code is written, you can add it to your report and use it like any other visual.  

What is the difference between a funnel chart and a pyramid chart in Power BI?

Answer: A funnel chart is a chart that shows the stages of a process and the number of people or items that move from one stage to the next, while a pyramid chart is a chart that shows the proportion of each category using a pyramid shape. Funnel charts are typically used to show the conversion rate of a process, while pyramid charts are used to show the hierarchy of the categories.  

How can you create a custom visual in Power BI using CSS?

Answer: To create a custom visual in Power BI using CSS, you can use the "Custom Visual" feature to write JavaScript code that generates the visualization using HTML and CSS. Once the code is written, you can add it to your report and use it like any other visual.  

What is the difference between a gauge and a card in Power BI?

Answer: A gauge is a visual component that shows a single value on a gauge, while a card is a visual component that shows a single value. Gauges are typically used to show progress toward a goal or target, while cards are used to show summarized data.  

How can you create a custom visual in Power BI using SVG and D3.js?

Answer: To create a custom visual in Power BI using SVG and D3.js, you can use the "Custom Visual" feature to write JavaScript code that generates the visualization using the SVG format and the D3.js library. Once the code is written, you can add it to your report and use it like any other visual.  

How can you create a custom visual in Power BI using React?

Answer: To create a custom visual in Power BI using React, you can use the "Custom Visual" feature to write JavaScript code that generates the visualization using the React library. Once the code is written, you can add it to your report and use it like any other visual.  

What is the difference between a bullet chart and a gauge chart in Power BI?

Answer: A bullet chart is a chart that shows progress towards a goal or target using a horizontal bar and additional visual elements, while a gauge chart is a chart that shows progress towards a goal or target using a circular gauge. Bullet charts are typically used to show progress towards a goal in a more detailed manner, while gauge charts are used to show progress towards a goal in a simpler manner.  

How can you create a custom visual in Power BI using TypeScript?

Answer: To create a custom visual in Power BI using TypeScript, you can use the "Custom Visual" feature to write TypeScript code that generates the visualization. Once the code is written, you can add it to your report and use it like any other visual.  

What is the difference between a line chart and a combo chart in Power BI?

Answer: A line chart is a chart that shows how a value changes over time, while a combo chart is a chart that combines multiple chart types, such as a line chart and a column chart. Line charts are typically used to show trends in data, while combo charts are used to show multiple aspects of data in a single chart.  

How can you create a custom visual in Power BI using Angular?

Answer: To create a custom visual in Power BI using Angular, you can use the "Custom Visual" feature to write TypeScript code that generates the visualization using the Angular framework. Once the code is written, you can add it to your report and use it like any other visual.  

What is the difference between a waterfall chart and a stacked bar chart in Power BI?

Answer: A waterfall chart is a chart that shows the change in value for each category using columns that are either positive or negative, while a stacked bar chart is a chart that shows the composition of each category using stacked bars. Waterfall charts are typically used to show the change in value over time, while stacked bar charts are used to show the composition of each category.  

How can you create a custom visual in Power BI using Vue.js?

Answer: To create a custom visual in Power BI using Vue.js, you can use the "Custom Visual" feature to write JavaScript code that generates the visualization using the Vue.js framework. Once the code is written, you can add it to your report and use it like any other visual.  

What is the difference between a line chart and a scatter chart in Power BI?

Answer: A line chart is a chart that shows how a value changes over time, while a scatter chart is a chart that shows the relationship between two variables. Line charts are typically used to show trends in data, while scatter charts are used to show the correlation between two variables.

Scenario: You are working on a report that needs to be shared with multiple departments, but each department needs to see different data based on their respective roles. How would you approach this in Power BI?

Answer: I would create a role-based security model within Power BI. This would involve creating roles for each department and defining the data that each role can access. I would then publish the report to Power BI Service and assign the appropriate roles to each department's users. This way, each department would only see the data that is relevant to them.

Scenario: You are working on a report that needs to be refreshed every hour. How would you configure this in Power BI?

Answer: To schedule a report refresh every hour in Power BI, the user can use the scheduling feature. The user needs to navigate to the dataset settings and select the "Scheduled refresh" option, and set the refresh interval to one hour. It's important to ensure that the data source has the necessary permissions for the scheduled refresh to occur.

Scenario: You are working with a large dataset that is slowing down the report's performance. How would you optimize the report's performance in Power BI?

Answer: To optimize a Power BI report's performance, one should first review the report design, ensuring best practices such as minimal visuals, limited data points, and appropriate visuals. Utilizing Power BI's data modeling features, like creating table relationships, calculated columns, and summary tables, can help reduce data queried. Additionally, using the performance analyzer tool can identify bottlenecks in the report and enable the necessary steps to be taken to address them.

Scenario: You are working on a report that needs to show data from multiple data sources. How would you bring this data together in Power BI?

Answer: Power BI's data modeling features can be used to create relationships between data sources. The data can be imported into Power BI, and relationships between tables can be defined based on common fields. In addition, data transformation features such as merging and appending queries can be considered to bring the data together before importing into Power BI.

Scenario: You are working on a report that needs to be shared with external stakeholders. How would you ensure that the data is secure and only accessible to authorized users?

Answer: To control access to the report in Power BI, security features can be used. This involves defining roles and assigning permissions to each role. Azure Active Directory can also be considered to manage user authentication and access. To ensure security, the report should be published to a secure workspace within Power BI Service, and any sensitive data should be encrypted both in transit and at rest.

In conclusion, Power BI is a versatile and essential tool for data analysis and visualization in the business world. It offers a variety of features, ranging from simple data visualization to advanced business intelligence capabilities. Our list of Power BI interview questions for experienced covers a wide range of topics, including data modeling, visualization techniques, customization options, and much more. Preparing for these questions will help you showcase your knowledge and expertise in Power BI during your next job interview. Whether you are a beginner or an experienced user, these questions cover will test your understanding of Power BI and help you become a more effective data analyst. Best of luck in your interview preparations!