Power BI Data Query and Reporting Quiz

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Questions and Answers

What percentage of community votes was attributed to DE?

75%

83% (correct)

67%

50%

How many distinct values are found in the State column of the Reports table?

69 (correct)

What does the unique values count in a column represent?

Total number of values that only appear once. (correct)

Total number of duplicated values in that column.

Total number of distinct values in that column.

Total number of values that appear more than once.

Which of the following statements about column distribution is correct?

It includes the count of distinct and unique values. Signup and view all the answers

In the context of profiling data with Power Query Editor, what is the primary purpose of assessing data metrics?

To understand the data's overall distribution and quality. Signup and view all the answers

Which data connector should be used in Power BI Desktop to pull data from Azure DevOps while meeting specific requirements?

OData Feed Signup and view all the answers

In Power BI Desktop, when aiming to authenticate to Azure DevOps, which requirement must be fulfilled when selecting a connector?

Analytics views must be utilized. Signup and view all the answers

Which of the following is NOT a valid connector option for sourcing data from Azure DevOps in Power BI Desktop?

REST API connector Signup and view all the answers

What percentage of community votes did the OData Feed connector receive for being the correct answer in the Azure DevOps connector question?

52% Signup and view all the answers

When shaping a query in Power Query Editor, if the data always starts on row 3, which setting should be prioritized?

Set row 3 as the starting point containing column names Signup and view all the answers

Which transformation should be applied to the Logged column to analyze complaints by logged date and use a built-in date hierarchy?

Split the Logged column by using 'at' as the delimiter. Signup and view all the answers

What is necessary for a Power BI dataset to refresh data from a Microsoft Excel file located in a OneDrive folder?

The dataset must use a compatible connector for cloud storage. Signup and view all the answers

Which of the following connectors can be used to connect to an Excel file in a OneDrive folder for Power BI?

Excel Workbook Signup and view all the answers

What is the purpose of transforming the Logged column's data before analysis?

To standardize its format for date analysis. Signup and view all the answers

Which of these connectors cannot be used for importing data from Microsoft Excel in a Power BI dataset?

ODBC Signup and view all the answers

Why might splitting the Logged column enhance the analysis of user complaints?

It separates the date and time, allowing for independent analysis. Signup and view all the answers

What will happen if the Logged column is not transformed correctly before analysis?

The data will be formatted as a string and cannot be used for analysis. Signup and view all the answers

What is the recommended way to analyze complaints based on the date logged?

Utilize built-in date hierarchy after appropriate transformation. Signup and view all the answers

What is the primary purpose of using Power Query Editor in relation to sales data?

To perform data transformations Signup and view all the answers

When creating Power BI reports with annual sales data, what should be included for better user interaction?

A slicer for month and year Signup and view all the answers

In a Power BI report, which of the following visualizations best represents sales trends over time?

Line graph Signup and view all the answers

Which sequence best describes a process to visualize sales data in Power BI?

Load data, add visuals, create slicers Signup and view all the answers

What must you do first to connect Power BI to an Azure SQL database?

Establish a connection string Signup and view all the answers

In which scenario would you primarily use slicers in Power BI?

To filter data based on user selection Signup and view all the answers

Which action is essential to visualize sales values over time?

Creating a time-based axis in a visual Signup and view all the answers

What is a critical requirement for a successful connection to a Microsoft Excel data source in Power BI?

The Excel file must be in the correct format Signup and view all the answers

Which two actions can effectively reduce query load times while still enabling analysis of sales data?

Remove the rows in which Sales[Status] has a value of Canceled. Signup and view all the answers

What type of relationship should be established between the Customer and Transaction tables for effective analysis?

One-to-many from Customer to Transaction. Signup and view all the answers

What data should be excluded from the Sales query to optimize performance without losing relevant insights?

Sales[Canceled Date]. Signup and view all the answers

Which column is least likely to affect the analysis when removed from the Sales query?

Sales[Canceled Date]. Signup and view all the answers

When designing a query, what is the primary reason to separate date and time columns in Sales[Sale_Date]?

To use either date or time independently in analysis. Signup and view all the answers

What is a potential consequence of not filtering out rows with a Status of Canceled in the Sales query?

Increased load times due to unnecessary data computation. Signup and view all the answers

How does changing the data type of Sale[Delivery_Time] to Integer improve the query efficiency?

It allows for faster calculations during data processing. Signup and view all the answers

If the custom email connector returns specifics for every sent email, which field is most critical for ensuring no duplicates in analysis?

ID. Signup and view all the answers

What is the primary purpose of adding a WHERE clause to an SQL statement during data import?

To limit the amount of data imported. Signup and view all the answers

For year-over-year calculations in Power BI, which feature is most likely necessary when dealing with time-based data?

Unpivoting columns to create a consistent time series. Signup and view all the answers

Which of the following statements is true about configuring the data model in Power BI regarding employee_id and employee_photo?

They should be marked as hidden from the report view. Signup and view all the answers

What is a likely outcome of not properly configuring year-over-year calculations in Power BI?

Inaccurate visual representations of data trends. Signup and view all the answers

Why is it important to understand the relationship between tables when creating an analytics report?

To ensure that data aggregations are correct. Signup and view all the answers

Which option would be best for optimizing the data model in Power BI when dealing with large datasets?

Using summarized tables instead of detailed tables. Signup and view all the answers

In what scenario would unpivoting data in Power BI be necessary?

When dealing with time-based measures across multiple columns. Signup and view all the answers

What is one risk of importing a dataset without applying a WHERE clause?

Overloading the model with unnecessary data. Signup and view all the answers

Study Notes

PL-300 Exam - Study Notes

This document contains questions and answers from a Microsoft certification exam.
- The questions cover topics related to Power BI
- The answers detail the appropriate storage mode, connector options, and other considerations for optimal Power BI model performance.
- The questions are focused on practical application and problem-solving within a Power BI context.

Topic 1 - Question Set 1

Question #1:
- Customer: Import
- Date: Dual
- Sales: DirectQuery
- SalesAggregate: Import
Question #2:
- Focus on minimizing load times and ensuring data is loaded based on refresh requirements.
Question #3: -Merge the Customer and Address tables to combine necessary data into a single Customer data view.
Question #4: -To consolidate customer data, merge the Customer and Address tables.
Question #5: -Combine the Customer tables: Append Queries as New -Action to perform: Disable loading the query to the data model.
Question #6: -Product Category: Inner Join -ProductSubCategory: Left Outer Join -Product: Inner Join
Question #7:
Question #8:
Question #9:
Question #10:
Question #11:
- Connectors: SharePoint folder, Web
Question #12:
- Different values in State including nulls: 69
- Non-null values occurring only once in State: 4

Topic 1

Question #1: The question describes a Power BI model with refresh requirements for different tables. Students are asked to select the appropriate storage mode for each table.
Question #2: The question pertains to the required refresh and storage mode configurations for tables within a Power BI model to ensure optimal load times for visuals.
Question #3: The question asks about the correct action in Power Query to create a customer record query by merging data from two tables.
Question #4: The question describes two datasets imported into Power Query and asks Students to execute a query to return customer data with specific columns.
Question #5: The question describes the import of two tables containing customer and address data to create a single row table per customer.
Question #6: The question asks about the correct merge types for three Power Query queries.
Question #7: The question asks about the correct step to perform first when building a Power BI report from three table queries in a pre-defined Azure SQL database environment.
Question #8: The question describes how to extract data from a Microsoft SharePoint folder using Power Query.
Question #9: The question is about combining two Excel tables using Power Query Editor.
Question #10: The question asks about how to analyze user complaints from a CSV file and use a built-in date hierarchy.
**Question #11:**The question asks which two connectors to use when importing a Microsoft Excel spreadsheet located in a OneDrive folder to Power BI.
Question #12: The question requires selecting appropriate answer choices from a given graphic to describe the profile of a specific data column.
Question #13: The question focuses on combining data within Power Query Editor.
Question #14: The question involves combining tables containing customer data to meet a specified requirement for minimizing data model size and supporting scheduled refresh in Power BI.
Question #15: The question asks for the correct sequence of actions to perform in Power BI Desktop.
**Question #16:**The question involves connecting to two Azure SQL databases and combining the data.

Topic 2 - Question Set 2

Question #1: Power BI dataset
Question #2: Data source from a Microsoft SharePoint folder
Question #3: Merge the Customer and Address tables
Question #4: Create a connection with DirectQuery-mode.
**Question #5:**The question pertains to merging 100 csv files residing in a folder into a single dataset.
Question #6: The question involves connecting three tables in Power Query Editor and consolidating their data.
Question #7: The question asks what you should do first when building a Power BI report.
Question #8: The question concerns creating a report that connects to a Microsoft SharePoint document library.
Question #9: The question describes three actions that should be performed in sequence to combine two tables within Power Query Editor according to requirements outlined in the scenario.
Question #10: The question pertains to creating a DAX measure to calculate the total sales for a given month from the previous year using a previously created measure and a date table.
Question #11: The question focuses on combining files with certain properties by using Power Query Editor.
Question #12: The question is about consolidating data from multiple tables in Power BI to create a single table.
Question #13: This question is about combining two or more queries, and includes an action to do on the categories query.
Question #14: The question involves configuring a data connection to ensure visibility within five minutes of updating an Azure SQL database with Power BI.
Question #15: The question is about connecting multiple CSV files residing in a folder.
Question #16: This question is about creating a single table from several files stored in a specific location for use in Power BI.
Question #17: The question is about using a single table to refresh the data daily regarding data from an on-premises Microsoft SQL Server database.
Question #18: The question pertains to connecting to a Cassandra database with Power BI. In the absence of a direct connector, alternative means of connection should be considered.
Question #19: This question is about combining two Excel tables into a single table to exclude any duplicates in Power Query Editor
Question #20: The question describes creating a connection between PowerBI Desktop to an Azure SQL database.

Topic 2

Question #21: Create three parameters (one for each Power BI Database), make sure parameter type is 'Text'.
Question #22: Remove duplicates in Country, and delete City column
Question #23: The question outlines a task where errors in the discount column of a table should be replaced with a specific value.
Question #24: The question discusses fixing a DAX expression error related to the usage of the ' & ' operator and mismatched data types in Power Query.
Question #25: The question relates to troubleshooting a Power Query error ("Datasource. Error: Could not find file") during data query execution.

Topic 3 - Question Set 3

Studying That Suits You

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Description

Test your knowledge on Power BI principles, focusing on data querying, metrics assessment, and connector options. This quiz covers critical aspects of data handling and profiling in Power Query Editor, particularly regarding Azure DevOps integration. Challenge your understanding of data metrics and unique value counts in reports.