12/12/2021, 13:19
Sofia University Business Intelligence Online Exam
Sofia University Business Intelligence Online Exam
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* Required
Exam Questions
3
What is BI ? *
(in your own words)
Enter your answer
4
What are the main differences between a Star and a Snowflake Schema? *
Snowflake schemas:
* use less space to store dimension tables
* more complex
* good for data warehouses
Star schemas:
* only join the fact table with the dimension tables ==> faster and simpler SQL queries.
* better for datamarts with simple relationships
5
What is data mapping in the context of the Qlik Sense script and what is it
used for? Please, provide an example. *
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The mapping prefix is used to create a mapping table.
An example usage is replacing field values and field names during script execution.
Another example is that you can replace join with data mapping as well, basically achieve the
same result as with it
6
Which of the following statements is NOT correct ? *
(mark only one wrong answer)
Dashboards are used to present a unified strategic picture of your business
Dashboards are used to present data from different perspectives
Dashboards are used to present detailed reports in the form of tables
Dashboards are used to present complex data into interactive and understandable
visualizations (charts, KPIs)
7
Which of the following is NOT a characteristic of a primary key? *
(Data Model)
Cannot contain null values
All of the above are not characteristics
Cannot be a combination of two or more fields
Cannot contain duplicate values
8
Which of the following are characteristics of Qlik Sense BI tool? *
(mark all that apply)
Does not support in-memory development
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Applying changes to the database as adding new data entries for instance
Automatic reload of the data extraction, transformation and load
Different levels of security and data access
Issuing invoices and other transactional documents
Visual presentation of the data in the forms of graphs and charts
Connectivity to various data sources
Flexible layers of ETL (Extract, Transform and Load)
9
You have two tables presented here.
What will be the result if you write the following script:
NewTable:
SELECT * From Table1;
Right Join
SELECT * From Table2; *
(Scripting)
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Answer 1: You have only 1 resulting table that contains all rows from Table2, combined wit
fields from matching rows in Table1.
Answer 2: You have 2 resulting tables. They are associated via the common field Key
Answer 3: You have 1 resulting table that contains these 2 rows with the common Keys 1
and 2
10
If you have these two tables with the same number of fields and same field
names what will happen? *
(Scripting)
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Qlik Sense will throw an error and the data will not be loaded
Qlik Sense will load two separate tables : OrderData and NewOrders
Qlik Sense will load only the first table OrderData
Automatically Qlik Sense will combine the two tables into one resulting table
11
Consider the following field is from a small table.
Which of the following options are available to you when you elect to add
OrderID as a measure in a KPI chart? *
(Layout calculations) (Select one or more)
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None of the above
Count(DISTINCT OrderID) The resulting measure is 3.
Count(OrderID) The resulting measure is 5.
12
In order to make an association between two data fields named differently in
two different tables in one Data Model, what are we supposed to do? *
(Hint: Think how we make keys?)
* we can rename the field in the second table to be the same as in the first one
* we can autonumber the two tables by giving the (first_field & second_field) as Key and then
we continue with different operations like join and so on
13
If we need or want to rename field/fields in the script, what can we use? *
(Scripting) (select one or more)
Mapping table
as
rename
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All of the above
14
Which of below charts are most useful to visualize a comparison? *
(Data visualization) (select one or more)
Gauge
Maps
Bar chart
Line chart
15
Which are aggregation functions? *
(select one)
Min(), Max(), Count(), LOAD, WildMatch()
Min(), Max(), Count(), Sum(), FirstSortedValue()
Min(), Max(), Count(), Sum(), LOAD, Blue(), WildMatch()
Min(), Max(), Count(), Sum(), if(), WildMatch()
None of the above
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