DA-100 Query Practice Questions
The free DA-100: Analyzing Data with Microsoft Power BI questions that deal with query, with answers and explanations. The full bank and the timed practice test cover every topic the exam asks about.
Question #2
Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution. After you answer a question in this section, you will NOT be able to return to it. As a result, these questions will not appear in the review screen. You are modeling data by using Microsoft Power BI. Part of the data model is a large Microsoft SQL Server table named Order that has more than 100 million records. During the development process, you need to import a sample of the data from the Order table. Solution: From Power Query Editor, you import the table and then add a filter step to the query. Does this meet the goal?
Correct answer: A
Explanation
Adding a filter step in Power Query Editor limits the rows that the query returns, so only a sample of the Order table is imported into the model.
Question #10
You open a query in Power Query Editor. You need to identify the percentage of empty values in each column as quickly as possible. Which Data Preview option should you select?
Correct answer: D
Explanation
Column quality: In this section, we can easily see valid, Error and Empty percentage of data values associated with the Selected table. Note: In Power Query Editor, Under View tab in Data Preview Section we can see the following data profiling functionalities: Column quality Column distribution Column profile Reference: https://community.powerbi.com/t5/Community-Blog/Data-Profiling-in-Power-BI-Power-BI-Update-April-2019/
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