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Power BI Questions and Answers > Get data in Power BI > Flashcards

Get data in Power BI Flashcards

1
Q

What are the different ways to get data into Power BI?

A

Connecting to data sources, transforming and cleaning the data, and loading the data into Power BI.

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2
Q

What are some common data sources that Power BI can connect to?

A

Excel, SQL Server, SharePoint, Azure, and various online services.

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3
Q

What tool in Power BI Desktop helps with transforming and cleaning data?

A

Power Query Editor.

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4
Q

What is the purpose of data transformation in Power BI?

A

To shape and modify data into the required format for analysis.

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5
Q

How do you load data into Power BI after connecting and transforming it?

A

By clicking “Close & Apply” in the Power Query Editor.

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6
Q

What is the first step in the data analysis process in Power BI?

A

Getting data from various sources.

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7
Q

What types of data sources can you connect to in Power BI?

A

Files (like Excel), databases (like SQL Server), online services (like Azure), and other sources (like web pages).

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8
Q

What is Power Query Editor used for in Power BI?

A

Transforming and cleaning data before loading it into Power BI.

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9
Q

What file types can Power BI connect to?

A

Power BI can connect to Excel, CSV, XML, JSON, and PDF files.

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10
Q

How do you import data from an Excel file into Power BI?

A

Use the “Get Data” option, select “Excel,” and choose the file to load data from.

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11
Q

What are the steps to connect to a CSV file in Power BI?

A

Go to “Get Data,” select “Text/CSV,” browse to the file location, and load the data.

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12
Q

What is the purpose of the Navigator window in Power BI?

A

To preview and select tables or sheets from the data source before loading them.

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13
Q

What are some relational databases that Power BI can connect to?

A

SQL Server, Azure SQL Database, Oracle Database, and PostgreSQL.

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14
Q

What is the primary benefit of connecting Power BI to relational databases?

A

The ability to perform complex queries and load large volumes of data efficiently.

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15
Q

How do you connect Power BI to a SQL Server database?

A

Use “Get Data,” select “SQL Server database,” enter the server and database details, and optionally write a query to load specific data.

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16
Q

What is DirectQuery mode in Power BI?

A

A connection mode that allows real-time data querying from the source without importing data into Power BI.

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17
Q

What is the purpose of parameters in Power BI?

A

To dynamically control data source settings and enhance report flexibility and reusability.

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18
Q

How can parameters be created in Power BI?

A

Through the Power Query Editor, by defining a new parameter with specific data types and default values.

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19
Q

What is a common use case for parameters in Power BI?

A

Changing database connections or query criteria without modifying the report.

20
Q

How do you use a parameter in a SQL query within Power BI?

A

By referencing the parameter in the query, such as using @parameterName.

21
Q

What are NoSQL databases?

A

Databases designed for large-scale data storage and for storing unstructured data.

22
Q

What are some common NoSQL databases that Power BI can connect to?

A

Azure Cosmos DB and MongoDB.

23
Q

How do you connect Power BI to an Azure Cosmos DB database?

A

Use “Get Data,” select “Azure,” then “Azure Cosmos DB,” and enter the account URL and key.

24
Q

What is the benefit of connecting Power BI to NoSQL databases?

A

To analyze and visualize large volumes of unstructured or semi-structured data efficiently.

25
Q

What are some online services that Power BI can connect to?

A

Services like Microsoft Exchange, Dynamics 365, Google Analytics, and Facebook.

26
Q

How do you connect Power BI to an online service like Google Analytics?

A

Use “Get Data,” select “Online Services,” choose “Google Analytics,” sign in, and authorize the connection.

27
Q

What are the benefits of connecting Power BI to online services?

A

To access real-time data directly from the service, enabling up-to-date reporting and analysis.

28
Q

What type of authentication is typically required for connecting to online services in Power BI?

A

OAuth or other service-specific authentication methods.

29
Q

What are the three storage modes available in Power BI?

A

Import, DirectQuery, and Dual.

30
Q

What is the Import mode in Power BI?

A

A mode where data is imported into Power BI and stored in-memory, providing fast performance for querying.

31
Q

What is the DirectQuery mode in Power BI?

A

A mode where queries are sent directly to the data source, ensuring real-time data without storing it in Power BI.

32
Q

What is the Dual mode in Power BI?

A

A mode that allows a table to operate in both Import and DirectQuery modes, switching based on the query context.

33
Q

What is a key benefit of using DirectQuery mode?

A

Real-time data access and reduced data storage in Power BI.

34
Q

What is Azure Analysis Services?

A

A fully managed platform-as-a-service (PaaS) that provides enterprise-grade data models in the cloud.

35
Q

How do you connect Power BI to Azure Analysis Services?

A

Use “Get Data,” select “Azure,” choose “Azure Analysis Services,” and enter the server name.

36
Q

What are the benefits of using Azure Analysis Services with Power BI?

A

Scalability, real-time data processing, and leveraging advanced data models for reporting and analysis.

37
Q

What type of models can be used with Azure Analysis Services in Power BI?

A

Both tabular and multidimensional models.

38
Q

What is the primary goal when addressing performance issues in Power BI?

A

To optimize the speed and efficiency of data retrieval and report rendering.

39
Q

What is one method to improve query performance in Power BI?

A

Reducing the amount of data loaded by filtering unnecessary rows and columns.

40
Q

How can aggregations help with performance in Power BI?

A

By summarizing detailed data into higher-level summaries, reducing query complexity.

41
Q

Why is it important to optimize DAX calculations?

A

Efficient DAX calculations minimize processing time and improve report responsiveness.

42
Q

What tool can be used to diagnose performance issues in Power BI?

A

The Performance Analyzer tool, which helps identify slow visuals and queries.

43
Q

What are common causes of import errors in Power BI?

A

Schema changes, data type mismatches, missing data, and incorrect file paths.

44
Q

How can you handle schema changes in Power BI?

A

By updating the Power Query Editor to reflect the new schema and ensuring all transformations are still valid.

45
Q

What should you do if there is a data type mismatch during import?

A

Adjust the data types in the Power Query Editor to match the expected types.

46
Q

What is a good practice to avoid missing data issues in Power BI?

A

Validate data sources regularly and implement data quality checks.

Power BI Questions and Answers (13 decks)

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