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DA-100,DA-100,Data AnalystExamQuestions and Answers. You have a large dataset that contains more than 1 million rows. The table has a datetime column named Date. You need to reduce the size of the data model. What should you do? · A. Round the hour of the Date column to startOfHour. · B. Cha...

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Voorbeeld van de inhoud

DA-100, DA-100, Data Analyst Exam Questions and
Answers.

You have a large dataset that contains more than 1 million rows. The table has a datetime
column named Date. You need to reduce the size of the data model. What should you do?
· A. Round the hour of the Date column to startOfHour.
· B. Change the data type of the Date column to Text.
· C. Trim the Date column.
· D. Split the Date column into two columns, one that contains only the time and another
that contains only the date. - Correct Answer D. Split the Date column into two columns,
one that contains only the time and another that contains only the date.


You have a custom connector that returns ID, From, To, Subject, Body, and Has
Attachments for every email sent during the past year. More than 10 million records are
returned. You build a report analyzing the internal networks of employees based on whom
they send emails to. You need to prevent report recipients from reading the analyzed
emails. The solution must minimize the model size. What should you do?


· A. Implement row-level security (RLS) so that the report recipients can only see results
based on the emails they sent.
· B. Remove the Subject and Body columns during the import.
· C. From Model view, set the Subject and Body columns to Hidden. - Correct Answer · B.
Remove the Subject and Body columns during the import.


The Impressions table contains approximately 30 million records per month. You need to
create an ad analytics system to meet the following requirements:

✑ Present ad impression counts for the day, campaign, and Site_name. The analytics for
the last year are required.

✑ Minimize the data model size.
Which two actions should you perform? Each correct answer presents part of the solution.


A. Group the impressions by Ad_id, Site_name, and Impression_date. Aggregate by
using the CountRows function.
B. Create one-to-many relationships between the tables.

,C. Create a calculated measure that aggregates by using the COUNTROWS function.
D. Create a calculated table that contains Ad_id, Site_name, and Impression_date. -
Correct Answer A. Group the impressions by Ad_id, Site_name, and Impression_date.
Aggregate by using the CountRows function.
B. Create one-to-many relationships between the tables.


Your company has training videos that are published to Microsoft Stream. You need to
surface the videos directly in a Microsoft Power BI dashboard. Which type of tile should
you add?
· A. video
· B. custom streaming data
· C. text box
· D. web content - Correct Answer · D. web content


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?
· A. Show whitespace
· B. Column profile
· C. Column distribution
· D. Column quality - Correct Answer · D. Column quality


You have a prospective customer list that contains 1,500 rows of data. The list contains
the following fields:

✑ First name

✑ Last name

✑ Email address

✑ State/Region

✑ Phone number
You import the list into Power Query Editor. You need to ensure that the list contains
records for each State/Region to which you want to target a marketing campaign. Which
two actions should you perform?

, · A. Open the Advanced Editor.
· B. Select Column quality.
· C. Enable Column profiling based on entire dataset.
· D. Select Column distribution.
· E. Select Column profile. - Correct Answer · C. Enable Column profiling based on entire
dataset.
· E. Select Column profile.


HOTSPOT -You have an API that returns more than 100 columns. The following is a
sample of column names.

✑ client_notified_timestamp

✑ client_notified_source

✑ client_notified_sourceid

✑ client_notified_value

✑ client_responded_timestamp

✑ client_responded_source

✑ client_responded_sourceid

✑ client_responded_value
You plan to include only a subset of the returned columns. You need to remove any
columns that have a suffix of sourceid. How should you complete the Power Query M
code? To answer, select the appropriate options in the answer area. - Correct Answer 1.
Remove Column
2. List.Select
3. Text.EndsWith


DRAG DROP - You are building a dataset from a JSON file that contains an array of
documents.You need to import attributes as columns from all the documents in the JSON
file. The solution must ensure that date attributes can be used as date hierarchies in
Microsoft Power BI reports. Which three actions should you perform in sequence? To
answer, move the appropriate actions from the list of actions to the answer area and
arrange them in the correct order. Select and Place: - Correct Answer 1. Convert the list to
a table

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